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Re: Lot's of popping and cracking on deceleration...
what is your vacume advance running on, ported or manifold? cause my truck used to pop and backfire when decelerating when i ran ported vacume advance, now that its on manifold it doesnt pop at all.
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eh 
1970 Chevy C20 daily driver 
1975 GMC Jimmy 4x4 project 
1966 GMC C10 Dad's project 
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