06 silverado Idles rough when cold

Discussion in 'GM Powertrain' started by 6T7GOAT, May 13, 2010.

  1. 6T7GOAT

    6T7GOAT New Member

    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. Z71_guy

    Z71_guy Epic Member 5+ Years 1000 Posts

    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

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