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Old 10-11-2011, 01:42 AM
Gen1dak Gen1dak is offline
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Hate to sound like a broken record but you absolutely must confirm that blasted intake belly pan gasket isn't blown. Running in third as opposed to 4th causes higher rpms which masks a vacuum leak. Backfiring is a symptom of a vacuum leak. It could be something else, but address the worst offender first.
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