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Thread: 454 backfire
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Old August 25th, 2011, 07:38 PM   #15
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just some ideas here:

remove the fan, find a cigar or some cigarettes, check for vacuum leaks. pull the tbi unit and look at the gasket, they crack pretty frequently.

whats the mileage on the motor? you could have a bad valve. other than that, timing could be off - worn distributor.
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