Re: 1966 c20
The slow back down to idle thing happened to me several times. You have some type of air leak somewhere is all I can say. Also some valves being a tad tight will cause that. Best thing to do is plug All the ports off on the carb and if that helps more than likely your PCV is not sealed correctly. Engines hate air leaks...especially 2 stokes.
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"Excuse the rust I use my truck"
1964 GMC 1500 305E/sm420 4 barrel intake mod and dual exhaust.
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1964 Chevy C20 292/SM420
1966 Chevy C10 292 hotrod 6/TKO600
My youtube channel aka Military Chevy:
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