My friend has a Pontiac GTP that had the exact same symptoms, except for the exhaust sound. (We never listened for that.) Anyway, it turned out to be a bad plug wire, and he replaced the them all with Taylor racing wires and the problem has never come back.
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96GTPRT: '96 Laser Red Tinted Mustang GT Convertible. (tan top). Flowmaster cat-back, Bassani X-pipe w/ cats, K&N FIPK, Hypertech 160* t-stat, MSD wires, Bosch plugs, Performance Distributors coil packs, FRPP 70mm throttle body, C&L 87mm mass air. Kenny Brown Super subs, 3.73's, BFGoodrich Comp T/A's
Civic...its whats for dinner. Don't ever pull a ricer fly-by!
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