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Discussion Starter #1
Ever since I took my '68 J Code (302) out of storage it backfires thru the exhaust on deceleration. I have a pertronics ignition. Is the timing too far advanced? How did it change?
 
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Discussion Starter #2
Check for breaker plate bind and/or vacuum canister failure.
 

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Also take a look to see if you have any exhaust leaks.
 
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