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Defective plugs, bad plug wires, blown head gasket, burnt valve, blown intake manifold gasket, serious vacuum leak, or severely worn piston rings. The computer could be bad as well, I had one that would randomly make the car run like crap(misfire included) a quick tap with a screwdriver would either fix it or make the car stall, replacing the computer corrected the problem (90 cavalier 3.1L)

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