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  1. #11

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    Quote Originally Posted by Arbitert343GS View Post
    I have a 1999 Chevy C1500 with a 5.7 and while driving my engine misses(tach bounces around), but at idle its ok. Also Im getting like 7 MPG and I have no check engine light on. What might be the cause of this?



    Take the HEI ignition module out of the distributor and have it tested at your local parts house.
    See The USA In A Chevrolet,
    Or Buy A Ford And Stay At Home!!


  2. #12

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    you also might wanna clean your throttle body, I had the same issue, until I cleaned my throttle body and replaced the IAC

  3. #13

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    Any luck diagnosing the culprit?
    -K&N Air Filter


  4. #14

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    Quote Originally Posted by micknice27 View Post
    you also might wanna clean your throttle body, I had the same issue, until I cleaned my throttle body and replaced the IAC
    Just wondering what the IAC is that you changed.
    2000 Chevrolet Silverado K2500 Crew Cab

  5. #15

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