[Conaway2]

I wonder if this is an ignition problem, because I had a similar issue a couple of years ago. The problem turned out to be a short of the ignition wire inside the armored cable. The original wire was still in the armored cable and the insulation had deteriorated badly.

I had another similar issue that turned out to be loose electrical connections in the terminal box on the firewall and on the ammeter connections. If those connections are even slightly loose, they will heat up as the engine runs and become intermittent.

Good luck figuring this out.
Jim