Opened the distributor up the other day. Pulled the vacuum advance off and sprayed everything with WD40. Cruising at a steady speed the car would buck a lot. Centrifugal advance shouldn't cause that, it reacts to engine rpm. Vacuum advance seemed fine but that's all I could think of. It should react to changes in vacuum, not rpm.
Anyway it seems better now. Idle drops down to where it should. Last year it would hang up at different rpms. Replaced the centrifugal advance but that didn't help. So anyway, all good now or at least for now.
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Hank
70 Chevelle SS396(454), M20, 3.73
My Chevelle
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