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Weird Truck Problem
This can be moved if it's in the wrong section.
My friend has a 1991 S10 5speed 4cyl. when it gets a load, it backfires through the intake, at WOT it sdounds like popcorn, backfires, and bucks badly. now we're repalced the EGR, fuel preassure diaphram, TPS sensor, wires, valve cover, checked springs and stuff visually. compression test came back bad on all four cylinders. sounds fine at idle. can this be a bent valve?
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2000 Trans Am WS6
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