[deuce_roadster]

One more thing to check would be swap out the resister. It could be broken but making a connection enough to run but when it heats up breaks the circuit to the coil. Get a jumper wire with alligator clips and hot wire the coil from the hot side of the starter switch at the bottom of your steering column and see if it runs fine. That would tell you if it was the switch or resistor assuming no shorts in any of the wires.