99 Silverado Idle Up And Down

1994 Chevy Silverado Transmission Fluid Type. When I hit the gas the engines just bogs down, begins to hesitate, and will not accelerate. However, after much email back & forth with a representative of Spectra Premium, I got the answer. with the IAC unplugged, it stops. I purchased a brand new battery. I have a 2004 gmc envoy 4x4 4. This can be due to many possible factors, including a bad voltage regulator, an alternator that's not in good condition (possible bad diode, bad rotor/stator, poor internal connections), poor/high resistant charging system connections, poor/high resistant grounds, and also the idle surging is enough to cycle the alternator in/out of the charging. It doesn't start easy either, it will crank and crank. Idles at 2000 to 500 to 2000 up and down Discussion in 'Engine & Drivetrain' started by Joaa, Oct 15 It's a vortec 4. The idle will rev up and down. what could it. I am going to take it to the local parts store to see if they can pick up anything on the coder but I wanted to get your opinon on where to start the. 0L Engine from CJ Pony Parts today! If your 1986-1993 Ford Mustang is not idling correctly then you need to check out this Idle Air Control Adjuster by Ford. Usually at start-up it is loudest, and this may even cause a misfire condition on a particular cylinder. This problem is most noticeable when you pull up to a stop. 1 liter v8 engine. 5 through 2005 LLY 6. With a little creative ingenuity I was able to solve my trucks sputtering issue. 99 Silverado starts fine then revs up an down rpm won't idle smooth then when gets hot runs like a new one changed egr - Answered by a verified Chevy Mechanic. First off, this is a fairly common problem for all makes and models. RPM go up and down EFI ENGINE IDLE UP. Bottom line. rpms go from 300-1100 The colder the weather the worse it is. i have a k&n cold air intake on it. My car has an automatic transmission. my 1994 Chevy 1500 350's rpm gauge keeps serging up and down It also sputters during. Not available with special finance, lease and some other offers. this happens under no load(no ac/pwoer windows/lights etc) and with any/all electrical items on. Normal fix is to re-synch key and BCM. I always am having it service to make sure I don't break down like keeping up with the oil and stuff. The Toyota 22RE engines use a "Linear" throttle position sensor. I can go out and crank it right now and it will idle like a new top, put it in gear and its almost as if the accelerator pedal is partially pushed, it just takes. DPFE Sensor and EGR Information. I tried to pull out vacuum hoses and see if it changes the idle, It does change abit (higher) then I put it back on and then it slightly goes down, but still 3000RPM and you can really smell the fuel. Read on for effective ways to track down noises, both outside and inside the cabin, and what can be done to correct them. so we ended up getting a used one, which doesn't work. The weird thing is, it starts and idles perfectly now, where it used to fluctuate up and down even at idle. 7: while driving truck it started bucking, rpms rapidly going up and down. ECT table must be adjusted up or down also. An ACDelco GM Original Equipment Fuel Injection Idle Air Control Valve controls the engine idle speed, and is a GM-recommended replacement for your vehicle's original component. Applications using a turbo or supercharger may have a 2- or 3-bar MAP sensor. Pull the EGR off, spray it down with some carb cleaner, put it back on and use a scanner to clear the code. Start the engine and take note of the idle RPMs. my 1994 Chevy 1500 350's rpm gauge keeps serging up and down It also sputters during. We could get it to idle down to normal sometimes by holding the brake in all the way. sometimes it will stay at 11 for 5-10 seconds then rise to 14. My fuel mileage is still out of wack, 15-16 mpg average. On Tuesday, GM idled its plant in Silao, Mexico that builds Chevrolet Silverado and GMC Sierra pickups due to a parts shortage from the UAW strike. 3 with 77k on it. 2001 silverado 4x4 x-cab 5. Need a little help. I have a 91 GMC Jimmy which idles horribly (and it has even stalled) when it is cold outside (17* C or less) and it is the first start of the day. When I'm accelerating and get to required speed my RPM gauge either drops and steadies or jumps up then steadies back. The textured, non-skid surface is black in color and robotically applied. When first started in cooler weather the engine misfires, runs rough. Try opening the hood and starting the engine cold up and feeling the engine to see if the idle seems to be unstable or the engine is missfiring. The check-engine light was coming on, the engine ran rough, and sometimes stalled completely, usually after starting up from a stop. Between 500 and 1000. so i put a 2 barrel carb on it and it ran ok then developed the backfiring on left cylinder. In a similar fashion, if there is carbon build up in the throttle body and the ECM/PCM is replaced/reprogrammed without performing the Throttle/Idle Learn procedure in SI, an idle. This will either clear up all symptoms or will like tonight keep idling hard. BlueDevil products are safe for your vehicle and can remain in the system until your next fluid change. Dad picked up his 2001 Silverado 9 years ago. It eventually set off the check engine light with cylinder 1 misfire and random cylinder misfire. I have a 99 LS Z71 answer to the comment above, I too had a problem with it seeming like a misfire, and the idle would sputter and go up and down at a stop. Then it will rev way up and back down to almost stall and sometimes it will stall and I half to restart the engine. Select year and engine make above. This means the sensor is designed to read up to 1-bar of atmospheric pressure difference. 3L Poor Idle Quality, Surge Posted to GM Driveability on 9/13/2007 11 Replies Have this truck that when it idles the idle kind of goes up and down or surges and when you are running down the road seems when you let off the gas pedal keeps wanting to go or accelerate a little then will eventually come down checked. The idle of a car engine is kind of like a human heartbeat: You can tell what shape it's in just by listening. The throttle cable was tighter than it should be. Tried this method. The engine control unit is responsible for managing the idle air control valve. Surging idle, before and after new IAC valve. 3 - Chevrolet 1999 Silverado 1500 question. term TRIM up or down by one count. 3L has had strong results and thus GMC has used it in a lot more than just pickups. Car starts, Idles rough, then dies. Need a little help. This electrically actuated valve regulates the amount of air that bypasses the closed throttle plate while at idle. Throttle/idle (1999 Chevrolet Silverado 2500) When the rpms drop below 750 my truck begins to rev up and down tring to pull the truck forward (or backwards in reverse). It could be better. Long story short he replaced the fuel regulater. Hillsdale Furniture Tuscan Retreat Medium Granite Top Kitchen Island with Two Baskets, Multiple Finishes,14-17 SILVERADO/SIERRA 1500/15-17 2500/3500 CREW CAB(EXCL DIESEL)PRO TRAXX 4IN OVAL STEP BAR BLK,Citrine and Diamond (SI2-I1, G-H) Cupcake Halo Engagement Ring 1. 99 Silverado starts fine then revs up an down rpm won't idle smooth then when gets hot runs like a new one changed egr - Answered by a verified Chevy Mechanic. Its only when you put it in gear or rev the engine that it goes haywire now. Car Shaking and Jerking w/ RPM going up and down Mini Spy it will rev up and down at idle but it stops doing it if you give it a bit of gas or simply put it in gear. 3 with 77k on it. How to repair Bad idle speed problem in car. i will be driving along and suddently you feel the truck begin to slow in speed, the throttle doesnt respond and when you come to a complete stop the RPMs which usually run around 1000 are down to 250. I start it again, revs up and drops Down and I pump the gas to keep it from stalling. Did this a few times after the trucks temp Guage read normal or in the middle of the temp Guage. 3 LS engine He would have gotten a consistent mis-fire code off one coil, the random mis-fire codes are a pain. sometimes it will stay at 11 for 5-10 seconds then rise to 14. Long story short he replaced the fuel regulater. It's going to be hard to really explain what my '02 5 speed blazer is doing but i'll try to do my best. I've got a rattle that's getting worse I need to chase down though. This is not a permanent fix, but a possible band-aid to get you home and peace of mind at the parts store. causing it to idle a bit longer before shutting down. REVERSE (R): To back up, first press down the clutch pedal. Our dealer replaced the crank sensor and we have had no problems since. On top of low prices, Advance Auto Parts offers 4 different trusted brands of Throttle Position Sensor products for the 2002 Chevrolet Silverado 1500. Will check when it cools down enough. The experts at 1A Auto show you how to replace the tensioner on your 96-05 Chevy Silverado, Suburban, or Tahoe; or GMC Sierra or Yukon. now have 107,000 miles The DTCs are normally P0172 system too rich (bank 1) (one causing freeze frame) and P0170 Fuel trim (bank 1) and sometimes 1491 EGR valve lift sensor insufficient flow detected If I let it go long enough I start getting codes P0300-04-05. I think part of the reason is that there are so many possible causes of an idle problem, so it ends up being a common issue. It involves two things. I pulled the TB (drive by wire) off and cleaned it really well and it bumped up to about 600-700 for a while but now it's back to 500. I have achevy 2500hd that use to idle at about450 -500 rpm and would stall sometimes now after I tuned it up plugs and wires it stalls worse runs strong no missing can't cross wires Was told possible throttle body unit goes and causes low rpm. The truck starts, idles, and revs normally and when accellarating slowly everything works just fine, but once you get past half throttle it falls on its face and acts like it has a clogged fuel filter or bad fuel pump. 99 Silverado starts fine then revs up an down rpm won't idle smooth then when gets hot runs like a new one changed egr - Answered by a verified Chevy Mechanic. Bottom line. I will be doing a tune up over the weekend since it is due, which is fairly easy with no plug wires etc just the ignition pack over the plugs. pop the hood, start the vehicle and move it from park to drive to reverse with the brake pedal down and you will see the engine moving. RPM go up and down EFI ENGINE IDLE UP. He said before that the pressure was all the way up,what could cause the vehicle to die? 2000 Chevrolet silverado. I always let my 86 warm up since its cold weather. Then it will rev way up and back down to almost stall and sometimes it will stall and I half to restart the engine. If all other components of the fuel system are working properly and there is still a problem with the idle speed, the screw may be adjusted. My fuel mileage is still out of wack, 15-16 mpg average. It turned out to be a vacuum leak inside the waste gate controller. If idle RPM is modified up or down, the VCM Editor>Edit>Engine>Idle>Base Running Airflow>Idle Airflow vs. Basically, this trouble code sets if the ECM cannot make the engine idle at a set (desired) speed by control of the IAC valve's position. One vehicle got a new water pump, thermostat, hoses, later a radiator and although it still ran up & down, one year I put on a new radiator cap and it suddenly was only half as bad. Starts back up but have to do the old gas and brake thing. we drove it and if you are driving around 55 -80 if you let off the accelerator and put it in neutral the idle stays up, depending the speed 1500 to 3000 rpm. When I hit the gas the engines just bogs down, begins to hesitate, and will not accelerate. And also if I don't run my truck every couple days something is draining the battery. I had a simular problem with my old GMC pick-up. 8 V8 with 40,000 miles. I'm going to call it a win though because it's 100% better than before. she starts at about 2500 rpm and finally comes down to 1200 rpm after awhile. The obd2 code showed a misfire in the #4 cylinder (P0304 I think). This kit features a fender mount for vehicles with a single battery. I can still roll it up & down by keeping my finger on the button, but the automatic feature doesn't work. When truck gets back down to idle it cools waaayyy down. I might get more requests about idle issues than any other topic. "I have a 2003 chevy silverado with the 4. He said before that the pressure was all the way up,what could cause the vehicle to die? 2000 Chevrolet silverado. Start the engine and let it warm up at idle. TRANSMISSION HOT IDLE Vehicle Reminder As soon. Getting HOT air when gunning up to about 3-3500 RPM's as expected. If you start it up and drive, it chugs, sputters, backfires, you can push the gas pedal to the floor and it does no good. The 2000 Chevrolet Silverado has 3 problems reported for idles high then low. My problem is at about 1500 to 3000 RPM's while driving at a constant speed (not slowing down or accelerating) my RPM's will go up and down about a 100 or so, causing the car to what i would say rock. The idle has always been very low @ 500 rpm. I had a simular problem with my old GMC pick-up. 3 v8, 130,000 miles. ECT table and change cell values to desired idle RPM. 8 V8 with 40,000 miles. It was just doing it while in gear at stoplights, but now does it while idling in park. Spray-on liner covers entire bed interior surface below side rails, including tailgate, front box top rail, gage hole plugs and lower tie down loops. com FREE DELIVERY possible on eligible purchases. Tried this method. Idling car engines may surge for several reasons. After that my truck worked great. Just stays a little high. I tried to pull out vacuum hoses and see if it changes the idle, It does change abit (higher) then I put it back on and then it slightly goes down, but still 3000RPM and you can really smell the fuel. After the engine warms up to normal operating temperature it runs fine. 2005 chev silverado 4x4 with a 5. I have achevy 2500hd that use to idle at about450 -500 rpm and would stall sometimes now after I tuned it up plugs and wires it stalls worse runs strong no missing can't cross wires Was told possible throttle body unit goes and causes low rpm. If you can't hear anything, hook up a vacuum gauge to the tree over towards the drivers side of the firewall and see what it's got. 99 Silverado starts fine then revs up an down rpm won't idle smooth then when gets hot runs like a new one changed egr idle air control throttle position plugs an wires cleaned throttle body. I've figured out that if i stop (in a safe place, of course) and cut the. Adjust each outside mirror so by moving them up and down or left that a little of the vehicle and the to right to see a little of the side of area behind it can be seen. Compare the values against specifications. When I hit the gas the engines just bogs down, begins to hesitate, and will not accelerate. What is an acceptable amount of up/down play in a distributor shaft? I contact both Spectra Premium and Cardone several days ago. with the lift pushing the window up into the channel, well gravity is on our side. Ok so I went to north woods auto because my truck was sucking too much gas and a rough idle. Sometimes the problem is caused by a gummed up or sticking idle air control valve (IAC) or. The 2000 Chevrolet Silverado has 3 problems reported for idles high then low. Normal fix is to re-synch key and BCM. High volt at cold start up and drops to normal range after warm. Replaces most small case 1g, 2g, 3g Straight Mount Ford alternator with straight up and down mounting points. REALLY low idle, how to adjust??? I remember in my '93 there was a screw that adjusted the idle up or down. I know that this is a dakota forum but when I got the new idle air control for my car, my cousin ended up buying the same. Stream ad-free with Amazon Music Unlimited on mobile, desktop, and tablet. 1994 Chevy Silverado Transmission Fluid Type. Once you have ruled out all the basics, you can go back to what the Chevy 4. Re: 99 chevy silverado Unstable idle when it worms up Check the engine mountain rubbers,, one or more of them is broken and needs to be replaced. on GMs, SECURITY light will be flashing, if it's BCM locking down starting system. Truck 99 chevy 350 idle up and down when started. When this happens it is sometimes necessary to perform an idle relearn to once again teach the car how to idle correctly. 4 days later it starts up again. im lost you can see the idle going up and down '99 SCSB Stepside Silverado, 5. term TRIM up or down by one count. Adjust each outside mirror so by moving them up and down or left that a little of the vehicle and to right to see a little of the side of the area behind it can be seen. Put gear shifter in "P" (Park), turn off all accessories. It's going to be hard to really explain what my '02 5 speed blazer is doing but i'll try to do my best. Car Shaking and. Chevrolet Silverado 1999-2006: Common Noises Diagnostic. 3L Vortec engine in it. The Premium filtration media has the capacity to hold up to 14 grams of dirt in the filter media A high glass content is woven into the blended media, providing greater efficiency and strength by trapping 99% of the particulates from getting into the engine. Hi all, I'm new here and I have a 99 4runner modded with an lq4, 4l80E, and a street cam. , and checked the airbox for the damage per TSB and no damage found. IT acts like it is starving for fuel. Listen to your favorite songs from Truck Sound Effects by Digiffects Sound Effects Library Now. Ran across this old post of mine and figured I should wrap it up. No matter what you're driving, we have the right 99 Silverado Center Console for your automobile. After the first few seconds, its idles rough. This kit features an engine mount for vehicles with dual batteries or just looking to keep it close to the engine. 3 with a 19' that is about the same without problems I leave it in 3rd as that gets the motor at about 2600 RPM which seems to give the best result, I have found if i use 4th it waits to long to drop to 3rd on hills and you end up droping to 2nd on long hills in upstate NY. Reply 1: Check for vacuum leaks. Next, start from idle and increase throttle opening while watching MAF reading. You sure the car usually idles at 900rpm cold? My mother's 98 Camry 4cyl idles in the mid 1k range after a cold start. 38 ct tw in 14K White Gold. When first started in cooler weather the engine misfires, runs rough. It was just doing it while in gear at stoplights, but now does it while idling in park. It will stay at about 1200 rpm when I. I am not getting as good of fuel economy as I think I should. Car Shaking and Jerking w/ RPM going up and down Mini Spy it will rev up and down at idle but it stops doing it if you give it a bit of gas or simply put it in gear. with the IAC unplugged, it stops. Replaced wires, plugs, distribu. But after it warms up idle starts serging up and Dow. All fixed, the car idles better than it EVER has!. For instance, if your vehicle has a heavy load or it is heating up too quickly, then the idle air control valve will adjust the RPM by increasing or decreasing it; respectively. I always let my 86 warm up since its cold weather. so we ended up getting a used one, which doesn't work. Thanks Steve, for that draft of the dissertation on how to fix idle/stumble. I've figured out that if i stop (in a safe place, of course) and cut the. Ram “Hemi tick” and Chevy AFM issues… No, if there’s one thing that’s done right on the Toyota it’s the powertrain/drivetrain. Every engine needs three things to run and idle smoothly without stalling: a correct air/fuel ratio, sufficient idle speed for the idle load, and a good spark. Car starts, Idles rough, then dies. IDLE TUNING Foreword by Rinkrat456: This article is literally copied and pasted from Krambo's Silverado SS page. The first start of the day would go just fine, but the rest would turn over and over rapidly until I pumped the gas pedal. When you start the car from a cold start it'll idle in the low 800-900 rpms, rev up a few times into 1100-1200 then idle fine at 1000rpms. Until this mourning when it would not idle at all until i started and held the gas down above idle speed for about 60seconds. Window Recalibration-Reset Programming Sequences. It was even lower when I bought it, sometimes as low as 300 rpm. Have code for high O2 voltage but sensor works fine. Cold stalling problems are the most common because the engine needs a richer fuel mixture to maintain idle speed until it warms up. Look for the early warning signs of transmission problems to save yourself money and a headache down the road. Hey everyone, Just bought a 2000 chevy silverado. 0L Engine from CJ Pony Parts today! If your 1986-1993 Ford Mustang is not idling correctly then you need to check out this Idle Air Control Adjuster by Ford. When truck gets back down to idle it cools waaayyy down. Chevrolet Silverado 1999-2006: How to Replace Oxygen (O2) Sensors. Surging idle can be caused by a number of different problems. when i got my 20hp twin the original carb was so gummed up it was nearly impossible to get apart. The check-engine light was coming on, the engine ran rough, and sometimes stalled completely, usually after starting up from a stop. Next, start from idle and increase throttle opening while watching MAF reading. One of the most common symptoms commonly associated with a problematic idle air control valve is irregular idle speed. im lost you can see the idle going up and down '99 SCSB Stepside Silverado, 5. most of the time it idled just over 1000 rpm. It's up to you to find the cause of the mixture issue. 8 V8 with 40,000 miles. The pressure should be holding steady in the range of 35-50psi for most applications. Press one of the four arrows on the control pad to move the Manual Mirrors mirror up, down, right, or left. Page 98 NEUTRAL (N): Use this position when you start or idle your engine. Surging at idle/rpms up and down then dies 24 Answers. Original review: Feb. Come to Victor Chevrolet to drive or buy this Chevrolet Silverado 2500HD: 1GC1KTEY6KF196914. Re: towing with a chevy silverado v6 I tow with a BASE 05 4. You may need to let the engine run for a few minutes in order for it to come down to its normal idle speed. This problem is most noticeable when you pull up to a stop. When its cold (as in first thing in the morning), it fires right up and high-idles for a few seconds and runs fine. I've heard people write that this is a normal cold-engine idle speed, but it wasn't like that when it was new, and I don't like the car's driving characteristics from 0 to the first couple of gear shifts. Compare the values against specifications. Coolant system failure can eventually cause major engine damage as running the truck hot can lead to head gasket failure or loss of power eventually causing the motor to stop running. If I shift it into reverse, the idle goes back to normal (600 rpm). 2001 silverado 4x4 x-cab 5. On top of low prices, Advance Auto Parts offers 4 different trusted brands of Throttle Position Sensor products for the 2002 Chevrolet Silverado 1500. Look for the early warning signs of transmission problems to save yourself money and a headache down the road. I had a high speed (60 mph) surge on a 99 td where the rpm would jump up and down every 4 seconds. With my misfire my mechanic showed me come up on his computer but he said it should store it and it's not it shows up as a misfire and goes away. 6L Duramax Diesel 2500 & 3500 series trucks. If it is bouncing around or going up and down slightly as the engine is idling, then you could have a mechanical issue or even an air or a vacuum leak like we talked about earlier. pop the hood, start the vehicle and move it from park to drive to reverse with the brake pedal down and you will see the engine moving. My problem is at about 1500 to 3000 RPM's while driving at a constant speed (not slowing down or accelerating) my RPM's will go up and down about a 100 or so, causing the car to what i would say rock. The Chevy Silverado 1500 full-size pickup truck is expected to see several updates and changes for the 2017 model year. After 2 miles or 200, it sometimes stalls when at a light. Surging idle can be caused by a number of different problems. I have a 2004 gmc envoy 4x4 4. I have a 91 GMC Jimmy which idles horribly (and it has even stalled) when it is cold outside (17* C or less) and it is the first start of the day. Plus rental car fees for me ($200). Of course, fuses need to be checked either. The idle is controlled by the idle air control valve and if it cannot keep the engine idling it will keep. The weird thing is, it starts and idles perfectly now, where it used to fluctuate up and down even at idle. One of the most common symptoms commonly associated with a problematic idle air control valve is irregular idle speed. These should be investigated, diagnosed, and repaired as soon. We could get it to idle down to normal sometimes by holding the brake in all the way. I start it again, revs up and drops Down and I pump the gas to keep it from stalling. i will be driving along and suddently you feel the truck begin to slow in speed, the throttle doesnt respond and when you come to a complete stop the RPMs which usually run around 1000 are down to 250. ECT table and change cell values to desired idle RPM. 7L hiccups bad at 40mph; 99 5. What's up with that???. My car would also Buck when I let off the gas and when i would coast. up and down has broken and they. When replacing door glass on certain year, make, model vehicles special steps need to be taken in order to properly replace and reprogram the vehicle so the electric windows work properly. Basically what I notice is unless you really baby it with slow acceleration the engine kind of pauses and sucks in a huge amount of air any time you press the pedal in an assertive way. Occasionally the rpms get so low that the engine dies, but that only seems to happen when I'm turning AND braking at the same time. Press one of the four arrows on the control pad to move the Manual Mirrors mirror up, down, right, or left. Also if i push her too much to go faster too quickly it starts acting like the transmission is slipping. When I start it in the AM, It idles at about 1000 RPM, but as soon as I put it in drive the idle will drop to 400. The stock MAP sensor used on all non-supercharged and non-turbocharged engines is what as known as a 1-bar MAP sensor. Read on for effective ways to track down noises, both outside and inside the cabin, and what can be done to correct them. The driver-side window no longer rolls up or down automatically. Silverado and Sierra ; 2000 Blazer Idle is Too High Then Goes Down Details and let it idle and warm up for a least 10 minutes. The voltage meter drops significantly and then bounces up and down slightly. Anyone else deal with this before. If it is bouncing around or going up and down slightly as the engine is idling, then you could have a mechanical issue or even an air or a vacuum leak like we talked about earlier. When I first crank up the truck it idles down like it suppose to, then. 2005 Chevrolet Silverado 1500 5. I'm not sure what the normal idle is. View all 99 consumer vehicle reviews for the Used 2001 Chevrolet Silverado 1500 on Edmunds, or submit your own review of the 2001 Silverado 1500. Look for the early warning signs of transmission problems to save yourself money and a headache down the road. Complete list of Chevrolet Silverado auto service repair manuals: 1999 CHEVY / CHEVROLET Silverado Pick up Truck Owners Manual ; VN VR VS VT VX VY 4L60E 4L30E AUTO GEARBOX REPAIR MANUAL. I have to admit it’s fun to stand on the pegs while you’re going down the road, can’t really do that on a cruiser. I put them in and my car runs like new again. But the surge problem is still there, and now it sometimes revs high. Code P0300 (multiple cylinder misfire) comes up every time it pops the light on. , and checked the airbox for the damage per TSB and no damage found. When I hit the gas down it loses acceleration almost like it's being starved of air or gas. This Is a write-up that will hopefully help Digi-Fart around the world for 8valve Golfs and Jettas built from 1988 - 1992 Here was my problem: My car's Idle would bounce anywhere from 400-1200 rpm. Just stays a little high. Insert the key into the ignition and start the engine. If your vehicle is suffering a rough idle condition (after replacing the spider or fuel pressure regulator), take a look at the section: Spider Fuel Injector Assembly O-ring is Not Leaking Vacuum, What Next?. We own a 2002 Chevrolet silverado LS 2500 hd with allison trans. The check-engine light was coming on, the engine ran rough, and sometimes stalled completely, usually after starting up from a stop. The Premium filtration media has the capacity to hold up to 14 grams of dirt in the filter media A high glass content is woven into the blended media, providing greater efficiency and strength by trapping 99% of the particulates from getting into the engine. The 2000 Chevrolet Silverado has 3 problems reported for idles high then low. Ignition Coils. No steady idling. Truck starts to have ruff idle then dies after idle drops considerably. 5 through 2005 LLY 6. When first started in cooler weather the engine misfires, runs rough. But over this past winter, I noticed a significant drop in oil pressure at idle when the engine/oil is hot. I can still roll it up & down by keeping my finger on the button, but the automatic feature doesn't work. No telling how long this car sat around. I've heard people write that this is a normal cold-engine idle speed, but it wasn't like that when it was new, and I don't like the car's driving characteristics from 0 to the first couple of gear shifts. Not sure if it's present in the tacoma, but I was able. When the air control valve for Chevy Silverado is clogged, it likely to lead to an instant, irregular deceleration as you lift your foot off the pedal, causing a backfire through the tailpipe and loading up the engine with surplus fuel. It’s good enough for me to live with, but not optimal. Every engine needs three things to run and idle smoothly without stalling: a correct air/fuel ratio, sufficient idle speed for the idle load, and a good spark. Bad idle air control valve Bad idle air control valve symptoms Idle speed goes up and down or high idle. The IAC valve position is referred to as IAC counts. Once you have ruled out all the basics, you can go back to what the Chevy 4. The Premium filtration media has the capacity to hold up to 14 grams of dirt in the filter media A high glass content is woven into the blended media, providing greater efficiency and strength by trapping 99% of the particulates from getting into the engine. Applications using a turbo or supercharger may have a 2- or 3-bar MAP sensor. Which is how I ended up on a Triumph Bonneville, just a nice relaxing ride on a standard shaped bike. 99 Silverado starts fine then revs up an down rpm won't idle smooth then when gets hot runs like a new one changed egr idle air control throttle position plugs an wires cleaned throttle body. REVERSE (R): To back up, first press down the clutch pedal. After that you're gonna need a schematic to accurately trace down the break in the circuit. No Misfire Diagnostic Trouble Codes. Find CHEVROLET 7. Has anybody seen or solved this issue? I have a 2006 4.