Odd "miss and hit" during acceleration

[Argess]

Thanks Guys. I've been thinking some more (which can be dangerous....LOL) and all things point to the problems being ignition related. Going back over the facts, all problems started once engine was run quite a while....i.e. "hot". I notice the coil is also quite hot. Somewhere my ignition is breaking down.

In the first case, it was happening at 1/2 way through an acceleration run (1/2 way between gear shifts), but that also could have been a point where the Hp, spark advance, rpm, etc all determined the point a weak spark would misfire. In the last case, the bogging and popping out the exhaust are almost certainly due to ignition break-down.

I am using 9mm Accel wires, new plugs, Mallory dist with Pertronix unit and an Echlin internal ballast coil. This old coil, of dubious origin, I had laying around in a box.....never used, but the box looks like it's 50 years old. NOS with a stress on teh "O". It's been successful now since 96 when I first got the car on the road. Perhaps it's time to upgrade.

Darned thing......coils hardly ever go bad. Guess I need to do some more testing this evening. Look for arcs and check the max spark travel from the coil to ground. Darned hard to nail down when it seems to be causing trouble only after it gets heated up.