manifold vaccum for vaccum advance ?'s

OldmanRick said

At this point, if it just started, you have to look at whats been changed. The carb wasn't touched so i would rule that out for now. The distributor, the wiring for it and the plug wires are all parts that have had attention at this point. That's the first place to look as any of these could be a issue. If you have a spare coil it may not hurt to try it cause it's easy to do.

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When you recieved the dizzy did you get the spec that the can was set for and that was confirmed on a distributor machine. Do you have a timing tape and are you confirming the changes to the can when adjustments are made? (may be adding more advance then you think). Does the popping seem random or could it be just one cylinder? A old school trick is to find a very dark spot at night and observe all the plug wiring and distributor area for any arcing. Maybe even move some wires around to see if you see anything.

P.S. Nevermind! try to find the vacuum leak first. Probably why it smokes on decel......probably sucking oil out the valley. I'm out.