Quote:
Originally Posted by T77911S
i would look at timing and advance .
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+1
Vacuum advance does it's primary work at lowish-mid range RPM. Cruising speed.
Your timing may be retarded if the advance pod on the distributor is not working. (part of the check distributor as suggested by JR).
Pop the cap. Hook a hose to the pod port and suck on the hose or use a mityVac and look for movement (or even listen for movement) of parts in the distributor. No movement, no vacuum advance.