Question about 1990 Chevrolet Lumina APV

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1990 Lumina running roung, power loss rough idle

I had the plugs and wires changed, and also changed the IAC motor. It is still idling rough and has a loss of power especially up hills. Like it isn't firing all cylinders. HELP!

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  • Anonymous Mar 13, 2014

    started after hitting potholes

  • Anonymous Mar 16, 2014

    rough idle and loss of power

  • Anonymous Mar 18, 2014

    Fusion 2008, 4 cylinder engine.

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On the chevy v6 engines it real comon to have intake leaks.I would try spraing carb cleaner around the intake while the car is running and see if it changes the way it runs.If it does that is your problem.If the intake has a leak it will **** extra air in and cause a missfire.

Posted on Mar 03, 2009

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Posted on Jan 02, 2017

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I have 1995 chevy lumina with the3100 engine. It starts fine but idle is rough and has loss of power and smells like unburnt gas.


How long since overall tune-up? Any applicable trouble codes?
The basics for a rough idle, check for a leak of some kind, fuel--egr--vacuum, something of that nature. Does it run ok off-idle?

Feb 16, 2017 | 1997 Chevrolet Lumina

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1999 lumina rough idle


check engine compression.

Nov 09, 2013 | 1999 Chevrolet Lumina

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Won't idle, runs rough under throttle


Check all of your tune-up parts. (Distributor Cap, Distributor Rotor, Spark Plugs and Spark Plug Wires) Also perform a compression test if no problem is found with the tune-up parts. Check also for vacuum leaks and the Intake Air Control Valve (IAC) for the "won't idle" problem.

Apr 10, 2011 | 1990 Ford F350

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Rough Idle when cold runs seems to run ok hot but still almost stalls when you turn on AC and you are at a stop also noticed that the volt meter reads 9v with the AC and the lights on with the AC and...


mcdevito75 here, Sounds like a faulty voltage regulator, it"s 1 unit with the alternator, change the alternator, also the alt. supplies juice to the ignition switch, distributor abd plugs, thus a rough idle due to bad alternator.

Jun 19, 2010 | 1994 GMC Suburban

1 Answer

IAC motor


OBD does not control, an idle logic circuit does, Disconnect the battery and let it relearn idle speed, it has fuzzy logic capability, so it learns your driving habits.

Jul 31, 2008 | 1994 Chevrolet Lumina APV

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