1993 GMC C3500 engine backfires

1993 GMC C3500
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RACER6
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Engine Performance problem
1993 GMC C3500 V8 Two Wheel Drive Automatic

truck starts and runs great at idle above 2grand it misses bad and backfires through the exhust the longer you run it the worse it gets till it won't run at all
Oct 25, 2009 at 7:31 AM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.
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