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Something electrical is breaking , shorting when hot ! Crankshaft position sensor , or some other sensor ! Next time it shuts off pull a coil off an see if it has spark ! If there is spark check fuel pressure ! If it has spark an fuel check for a computer pluse , 5 volt reference voltage circuit ! Do you know what that is ? Making Sense out of Sensors
An ignition misfire feels like the car is stumbling. Get it up to about 55mph and ease into acceleration, if it stumbles you might want to get a tune-up. If it stumbles at idle and gets better with acceleration, you might be dealing with a fuel delivery misfire(clogged fuel injector or fuel filter)
ENGINE STUMBLING OR SURGING.PROBLEMS MOST LIKELY STOP UP FUEL FILTER OR WEAK FUEL PUMP.CHECK FUEL PUMP PRESSURE IT SHOULD BE 48 PSI.IF FUEL SYSTEM OKAY.OTHER POSSIBLE CAUSES FOR STUMBLES COULD BE DIRTY FUEL INJECTORS - EGR VALVE PROBLEMS - INTAKE AIR LEAK. FAULTY TORQUE CONVERTER.CHECK TRANSMISSION FLUID LEVEL.MAKE SURE ENGINE WELL IN TUNE CONDITIONS.
The mechanic should check on the fuel pump and the Idle of the fuel pump . if the fuel pump is malfunctioning then you have to repair it.Then also the throttle if the throttle is being worn out or malfunctioning then you have to repair or replace it.The Idle should be adjusted because of the engine is stumbling .the reason why the engine is stumbling or the car over heats is that the fuel pump is not functioning good or there is a problem in the fuel pump.and also it is the reason why the engine light goes off when cold because of the engine problem is in the fuel pump.such fuel or is not entering or going to the engine.