1976 cadillac running issue

My 76 cadillac ambulance will crank and run till it gets warm then shuts off like you turned the key off. I will let it sit 5-10 minutes and will crank back but only run a couple minutes then shut off again. It seems like an electrical issue but I have put a new coil, rotator, ignition module, and new connections but still have the same issue. I wanted to see if you guys have any other suggestions or experiences with something like this.
 
Had that problem with a 75 cb i bought fought it all the wayhome. Turned out to be the caren conector in the cap had broken. It would run till the ark would heat up abd expand it till it could not jump the gap.
 
Chk voltage at the distributor cap connector. This is 12 volts with key on. Might be losing voltage, bad ignition switch, fusible link etc. There is a clip that holds it to the cap, if clip is broke that can cause a problem also. It is the large 10-gauge wire. Wiring problems are about impossible to diagnose unless you are there in person.


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