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There could be many causes, but the first that comes to mind is that the timing [between the pistons/valves and distributor] has "jumped or slipped," causing the the fuel mixture to be ignited by the sparkplugs, WHILE the intake valves are still open.j3h.

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โˆ™ 2007-03-11 13:24:50
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Q: What would make a 1991 Pontiac Grand Am cough and sputter backfire up the carbarator?
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