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  1. #1

    Default My truck is Idling at high RPMs

    Just today my truck started idling at high RPMs, high enough to accelerate the truck in first gear. The truck is a 90 k1500 with a 350, 5 speed, 4wd. When the truck is in neutral, the shift light sometimes stays on also. I feel like it's some kind of a sensor issue somewhere. One last piece of info-if I shut the truck off and restart it returns to normal idle.
    Thanks guys

  2. #2

    Red face

    Quote Originally Posted by gt1009 View Post
    Just today my truck started idling at high RPMs, high enough to accelerate the truck in first gear. The truck is a 90 k1500 with a 350, 5 speed, 4wd. When the truck is in neutral, the shift light sometimes stays on also. I feel like it's some kind of a sensor issue somewhere. One last piece of info-if I shut the truck off and restart it returns to normal idle.
    Thanks guys
    idle air control valve "iac" they will do that you can try to take it out and clean it but that only last for a while

  3. #3
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    murdog94's Avatar
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    Yep IAC would be my first check.. My 1988 had a similar problem.
    Mike

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    "Hold it to the floor till you see God.... Then Brake!!!!"

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