Mine does the same thing. Someone told me once that it could be the RV cam that I put in it, makes it harder to even out at idle. But I don't know anything about that. I think I might try that idea for checking the gap on the plugs.
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Long Knight
'71 C-20, 350ci, TH350, Edl. 1406 Carb w/elec.choke, Ignitor ignition, Viper Tires, Orange Dipstick
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