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  1. #1

    Default 06 silverado Idles rough when cold

    My 06 1500 silverado has the 5.3 engine. it has 64k miles on it. When I start it up in the morning it will fire up fine but it has distinct issues holding a steady idle. At first it was hardly noticable but is getting progressivly worse. It seems to be magnified when I put it in gear and hold my foot on the brake. It has not set any codes but it is obvious I have an issue, the rpms will drop 300-400 when it happens. I haved cleaned the throttle body but it did not seem to help. I dont notice any issues while driving just when sitting still and especially in the morning it is not as noticable once the truck warms up. What should I look for? Thanks Mike

  2. #2


    sounds like its a vacuum leak, when its cold start the truck and spray carb cleaner around the base of the intake to check for leaks

    2003 Z71 Silverado LS
    Access roll up cover
    Bed Rails
    Billet Grill insert
    Bed Rug
    CB with PA system
    Waiting to be installed
    Two 8in RF HX2 punch( would have 12s but they got stolen)

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