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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72 Sierra Grande 2500 BB
72 Sierra 2500, 42K miles, factory buckets
72 Cheyenne 20
72 Chevy SWB, Factory BB, Leaf Spring
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