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Hi there, I've got a 1972 318 .030 overbore 1.88 intake valves eddy Performer 2.5 exhaust Holley 650cfm Spreadbore 904 tranny 3.55 gears The runs smooth at about 1000rpm. But once I put it in gear the idle drops and it starts shuddering every so often in a random way. It isn't a...