Question about 1988 GMC S-15

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Truck misfires at a steady rpm

Truck idels fine. when your at say 3000 rpms in third gear the truck misfires. does it in any gear as long as your at a steady rpm

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  • Marvin
    Marvin May 11, 2010

    Check and see if the egr is stuck open.

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Check your distributor. Sometimes the bearings that hold the shaft in place wear out and causes movement with the rotor so it doesn't turn right. It will cause the rotor to not hit the points just right under the cap.

Posted on Sep 03, 2012

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Sounds like tune-up What has been done?

Posted on Jan 31, 2009

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How many miles does the truck have? It sounds like the timing chain has slack in it, making the timing get off???

Posted on Jan 31, 2009

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