Depends completely on which cylinders as to what is the problem.
1 x
x 4
x 6
7 x
The intake manifold feeds the cylinders marked X from one side of the carb, and the numbered cylinders from the other.
If it's that pattern, either side, you have a jet not feeding fuel.
If it's a different pattern, you have a distributor problem, most likely.
I would bypass the vacuum advance and see what effect it has. An intermittent vacuum leak on that circuit would cause similar problems.
Allan E.
Curmudgeon Extraordinaire
Charter Member, Old Hippie IH Club
Old fashioned binder freak
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