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well the reason i was asking was that when you put on an aftermarket muffler on it will run fine for a little while but then the muffler starts gettin louder and yu start losing backpressure and it affects your acceleration off the line. but if its 1 like you say then that should not be the problem. i think you should do a good tune up. fuel filter, pcv valve, oil change with a good synthetic oil, spark plugs and wires, distributor cap and rotor button. then post back and let us know.
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