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Old 12-12-2010, 11:01 AM   #5
Papa Smurf
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Join Date: Feb 2009
Location: Ben Wheeler, TX
Posts: 131
Re: Back firing and Missing Please help

I recently had the exact same problem with my 72 c20 work truck. Try spraying some Berryman B-12, or similar, around the intake manifold. If there is a leak, it will pick up RPMs with the spray. Mine was leaking. Raplaced gaskets and torqued and it runs like a champ.
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