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1990 Ford Mustang LX 351M powered!! Project Cherry Bomb!!
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Never mind, stupid hit keyboard before brain engaged... Ok I'll toss it out... Are you sure the distributor gear didn't slip on the cam? And I'll agree with replacement of timing gears and chain w a double roller.. only other thing I can think of is possible the backfire came from the keyway on the reluctor in the distributor is worn out and is causing a misfire because it's just spinning freely?
 
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