I skimmed the thread pretty good, I agree a worn out dizzy can cause much grief throwing multiple intermittent problems which can lead to wild goose chases. New (rebuilt), OEM replacements arent too expensive from your local parts supplier. Will work fine in stock and slightly modified engines. Also, you mentioned your carb is new, what kind of carb did you replace? Is your manifold designed for use w/ the carb your using? I know its an odd question, and generally people say.. well it bolts up, so it must work. But back in high school we swapped a carb... like q-jet to edelbrock.. it bolted up, but took a lot of major adjusting to run even halfway decent, and still popped and stuff.. turns out the carb didnt fit the manifold completely and there was a sliver of air leaking in under the base gasket. To solve it we had to use a special metal plate like a heat dissipater between the manifold & carb... More on the carb, I didnt see how many CFM it is, and after you installed it was it tuned for the engine? most likely the carb isnt CAUSING the problem, but if its grossly mis-adjusted it will definitely amplify the problem. Dont read too much into my previous statement though as it mainly applies to GROSSLY MIS-ADJUSTED carbs... (i.e. it took LOTS of fiddling with after installed) While I dont think this will solve your problem, it could help isolate it a bit more. Good Luck.