A poor running engine can be a result of electrical and/or fuel issues. Best to work on one 1st before going to another. I usually start by thoughly going thru the fuel side 1st; making sure the tank does not have stuff that can plug up the bottom, clean sediment bowl/screen, manifold is properly sealed to the head, air flow to the carb thru the air cleaner, good flow to carb, and thoughly cleaning the carb and all the little passages with brake cleaner, thin wire, and compressed air. Once I am satified that the fuel/air supply is good, I will then move to the electrical side; check the voltage to the coil with key on/off, check voltage from coil to points with key on/off, clean/replace/set point gap, check all plug and coil wires for continuity...and make sure someone has not installed the carbon core wires, check cap/cover for cracks, the condensor can sometimes cause issues, as can an intermittent ground on the points.
Trouble shooting and diagnosing can be a PITA, however, the reward comes when the gremlins are disposed of and the engine runs as it should.
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