I had this exact problem on my 401 many years ago. A previous owner had connected so many things off the ignition switch and the switch can’t handle that much current draw. The worst was the electric radiator fan that had been installed. The car would start and run fine. As it got up to temp, the fan would turn on and the ignition would have problems….. the power to the coil was now too low to run well.
I rewired the system, installing relays, and this took the load off the switch itself. Now the switch only sends a signal to a relay to energize the fan and other accessories.
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