I would guess a wiring problem. Most ECUs are very reliable. All it takes if one bad connection and your car dies. I would try to eliminate things. Can you hook up a laptop while driving to see if the ECU looses power? You could make up a test light for fuel pump power and see if the light goes out when you car dies.
Good luck
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Dean
911 SC turbo, 3.0L 930 motor, G50, 930 brakes, DTA EFI, 352 RWHP DynoDynamic dyno,
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