Question about 2002 GMC Sierra 1500

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My gmc sierra 1500 runs fine on flat ground but when i climb a hill it bogs right down and the check engine light flashes

Have not done anything yet do not know where to start i also get a misfire code

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  • brettparker Dec 06, 2014

    If it has a misfire then it should say what cylinder. The misfire comes from the spark plugs/wires. May have a faulty wire or fouled plug. 6 months is a long time. How many miles have you put on it in 6 months? If it's not the plugs or wires it maybe the coil which is what the wires come from to the spark plugs.

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Hi Dale, Go and by a Crank Position Sensor W/ shims and install it, (timing cover at bottom right side) GM has had a problem with this. Crankshaft end play. Hope this helps, Good Luck, Randy.

Posted on Jul 11, 2015

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Start with the spark plugs and wires. That should clear up the misfire.

Posted on Dec 06, 2014

Testimonial: "plugs and wires where replaced only 6 months ago"

  • Dale Edwards
    Dale Edwards Dec 06, 2014

    spark plugs and wires were replaced only 6 months ago do not think they went bad already

  • Dale Edwards
    Dale Edwards Dec 06, 2014

    could it a camshaft sensor

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