Question about 1993 Chevrolet K1500

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I have a 93 chevy pick-up. I rebuilt the engine and installed a 262xe flat tappet cam while I was at it. I started it up and I went to set the timing and it surges and idles rough. The fuel filter has been changed recently, the egr has also been replaced.

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  • Richard Scordino May 11, 2010

    I don't know what the profile on that cam is but generally any cam with 220 degrees of duration or more can cause vacuum problems which can influence idle, computer controls etc.

  • Jerry Koski
    Jerry Koski May 11, 2010




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Usually the I.A.C. valve is the culprit. Double check your timing marks. Make sure your injectors are spraying in a cone shape pattern. Look over the engine completely you may have forgotten to plug something in( vacuum line, electrical connector) Good luck.

Posted on May 03, 2009


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