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BACKFIRING, BOGGING, TRIED EVERYTHING...

1988 GMC Van

Engine Performance problem
1988 GMC Van V8 Two Wheel Drive Automatic 88000 miles

i have a 88 gmc utilitvan 3500 bob truck with v8 tbi, 88000 miles.

it backfires, and tries to go dead on acceleration. However it does seem to idle ok. It often starts its rough running about 2 minutes after cranking.

we have tried IAC, Map sensor, fuel pump, fuel injectores, plugs/wires/cap, o2 sensor, cleaning wires, basically all the bolt on parts. Fuel is good also.

What else could it be?
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Nevadasixx
January 23, 2010.



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