car backfires thru the exhaust when jumping on the throttle while in gear

1988 FORD MUSTANG
90,000 MILES
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MIKE88GT2012
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just bought the car the motor was rebuilt and it revs ok when in neutral but does seem like timing is slow however when you jump on it while in gear it back fires. Does that mean the timing is slow or fast, or is the timing off a tooth?
Mar 18, 2012 at 9:43 PM
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