Missing

AJ/FormS said

Thats a classic over-advanced symptom.
Or, plugged air bleeds/emulsion holes.
The quick check is to defeat the vacuum advance signal.

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What he said^^ "Unplug vacuum line from distributor and plug the hose and try it. You may also have water in the fuel and just enough in the bottom of the carb to occasionally get sucked through a jet.... Does this car have EGR?