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I had this same condition on my 1974 164E. It would die after a few minutes once the car was warmed up. If I let it cool down it would run for longer periods and if I didn't it would not start or start for a minute and die. I swapped relays, filters, fuel pressure regulator. I swapped out the six month old coolant temperature sensor to a used spare I had and the problem has not returned. I am not sure if the wiring at the connectors was to blame and I never did anything to repair them. No problems. I tested the sensor with a digital meter so I could not see dead spots in the curve but it did test within specs. Also, if the coolant temperature sensor is not connected the car will not start.
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