Question about 1998 Chevrolet C1500

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Idles poorly when started. rpms go up and down.Will run fine after about 30min.its a 5.7 liter v8 vortec

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Check out the MAF sensor (Mass Air Flow) and make certain that there are no loose hose clamps on the induction boot or vacuum leaks, especially between the MAF sesnsor and the throttle body.

Posted on Jun 06, 2010

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Posted on Jan 02, 2017

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Fuel problem


try checking the eec relay and the eec relay. Does this truck have dual tanks. If it does check the selector switch. mine went bad and burned up both relays. If these are not the problem then you will need to check fuel pump. it or they are located in the tank or tanks.

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Recently started idling ruff with loss of power


You will need to figure out if it is fuel or ignition related.
If you have not done a tune-up by replacing plugs and other parts within the past couple of years, start there. Including the fuel filter.
Is the check engine light on ?

Jun 29, 2012 | 1997 GMC Sierra

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2001 ford expedition starts up fine and idle fine in warm weather, but when the temperature is below freezing it starts up but before warming up it idles rough and then shuts down.


sounds as though the fuel system is set for a differant climate then your living in take it to the shop and get it set for your area

Jan 02, 2012 | 2001 Ford Expedition

1 Answer

I have a 97 s10 and starts and runs fine when cold but after it warms up i have to hold the gas peddle down to the mat before it will start again and when it does start it revs up to 1 1/2 to 3000 rpms and...


The repair for this is to scan the computer and see what codes are present if their are no codes indicating the TPS switch the problem will be your fuel pressure regulator.This is a fairly big job it requires removing the intake manifold if this is the 4.3L vortec engine.But Iam not sure which engine you have so this applies only to the Vortec Engine.

Apr 29, 2011 | 1997 Chevrolet S-10 Pickup

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I have a 1998 GMC Sierra, 5.7 liter Vortec 4x4. It has 160k miles. I have noticed that it idles at around 500 rpms when its warmed up. Not sure if this is normal. However, I have noticed a bit more...


The normal idle for your engine should be 550 to 600 RPMS so thats not to far off . But the fluctuation is more likely the crank pisition sensor then the EGR valve this engine has a condution called crankshaft wip witch is normal but going down a rough road can somethimes set off a misfire code It wouldn't be a bad idea to take the EGR valve off and clean it and check it but the CPK would give you the fluctuation in RPMS . It still could be a few outer things but this it the most likely cause

Apr 02, 2011 | 1998 GMC Sierra

1 Answer

I have a 1995 Buick Regal with a 3.8 V6. Car will start just fine on a cold start but will not continue to run unless you hold the engine on at least 3000 rpms for about 30 seconds. it will then idle just...


i think you might be right it sounds like your engine is getting over fed fuel you are probably not getting very good fuel mileage either the 3.8 and 5.0 would defintely require the same volume of fuel it is probably playing havoc on the pressure regulators i would get another fuel pump and start there

Jan 27, 2011 | 1995 Buick Regal

1 Answer

Idle problem


throttle position sensor is what I replaced on mine. Could also be a short in a wire that controls throttle. That was 6 years ago and it was $100. Took it to a shop, that's all I got.

Jun 24, 2008 | 1993 Pontiac Grand Prix

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