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Idle Problem!!!

This is a discussion on Idle Problem!!! within the General Help forums, part of the LSx Technical Help Section category; So when I start my car the RPM's go up to around 1000 then drop straight down to 400 and ...

  1. #1
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    2000 Pontiac Firehawk

    Idle Problem!!!

    So when I start my car the RPM's go up to around 1000 then drop straight down to 400 and from there it fluctuates from 400-600. Once I get to a stop light it goes to about 800 then slowly goes down towards 400 RPM again. Also, I noticed a few times while driving that the car jerks or bucks a little, almost like its about to run out of gas. Things under the hood visually look fine. Any ideas????

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    Senior Member TLS_Addict's Avatar
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    Ok, I had something like this about 2 weeks ago but not on the scale you are talking about. Here are the things I did and I havent had an issue since.

    1. Clean air filter. It its a K&N you may have oil on the MAF.
    2. Clean the MAF and be sure NOT to touch the filaments.
    3. Clean your TB.

    Put everything back together.

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    I have done all of those things the past few months but I will again. Thanks for the idea.

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    I was in a hurry so I didnt get to type everything.

    How many miles are on your car? Have you changed the plugs? Have you changed the plug wires? Have you changed your fuel filter?

    Throw in some fuel system cleaner as well. Depending on miles and what not it may be a combination of things.

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    The car has 77k on it. Plugs and wires were changed at around 50k. Haven't changed the fuel filter. Will try fuel cleaner additive.

  6. #6
    Smiles for 9.5 Years cammed goat's Avatar
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    Also, check where the intake bellows mates with the throttlebody. If there is a gap in that region, idle will be affected.

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    Quote Originally Posted by cammed goat View Post
    Also, check where the intake bellows mates with the throttlebody. If there is a gap in that region, idle will be affected.
    You are 100% on that. I didnt have mine hooked up one day and just a small 1/16h gap was at the bottom of the tb/bellow and it ran like crap.

    I still would check the wires to make sure there are no cracks or breaks anywhere. Fuel filter is cheap, something like $14.

  8. #8
    never enough ponyslayer's Avatar
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    check the IAC valve also, may have carbon build up

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