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  1. #1

    Default Egine runs rough while idling

    Well I really hope someone hear can help me. I have a 08 silverado 1500 LTZ w the 5.3 V8. From day one when ever I stop at a stop light the engine runs rough and the tach jumps up and down like a yoyo.The engine also acts like it is getting starved for gas.I have had it in the dealership several times and they say this is normal. I have 8,000 miles on it.Thanks to one and all.

  2. #2


    not normal
    do you happen to have what sounds like a vacuum leak? the one time mine did that, my (correc me if im wrong) PVC valve was uncovered and was sucking air and causing it to act same. I would pop the hood in the drive way and leave it in park, and see if anything sounds amiss. or goto a different dealer/shop.
    how much does it jump?
    2004 Silverado Crew Cab-z71-4x4-5.3-100k+ miles-KN FIPK Stage 2 CAI-Flowmaster 40 muffler w/ dual tip-Apline deck/alpine amp, Pioneer components front/Pioneer Back/2x10" MTX Subs under rear seat-Cooper ST tires

  3. #3

    Join Date
    Feb 2008
    Red Wing, Minnesota, United States


    Take it to another dealership for a second opinion, I can tell you that my local Chevy dealership is a joke and dont trust them one bit, so my family goes about 25 minutes away and its night and day difference for service, sales and showmanship
    99 K1500 Suburban LT "THE BEAST"
    Hypertech III, K&N, true dual

  4. #4


    i will try both ideas. The tach moves about a 1/8 of a inch.
    Thanks for both ideas I will let u know.

  5. #5


    I had the same problem with my 03 silverado... I took off the throttle body cleaned the carbon build up with throttle body cleaner and I cant stress enough "throttle body" cleaner dont use carb cleaner cause it will damage the sensors in your throttle body. put it back on and its ran like a champ since.

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