[rwest]

Red relay in the front trunk is the fuel relay.

Tach going to zero is your big clue that it is electrical or ignition. If you haven’t done points, plugs, cap, rotor and wires in awhile, that would be a good start.

I had a similar problem that turned out to be the tiny wire going from the points to the distributor connector- only about an inch long wire and points looked great, but when I put an ohm meter on it and wiggled the wire, the meter numbers went crazy.

Permatune ignition boxes are famous for having intermittent issues, but they seem to do it from heat and run fine after cooling off.