Possible fuel pressure issue (pump, pressure regulator). Try running the car with a fuel pressure test gauge attached to the test port on the fuel rail to see if the system is losing pressure. Another perennial favorite is the crank position sensor, which can act up when hot, causing the DME to turn off the fuel pump. You can test the CPS:
1. Connect ohmmeter connector part to rpm/crankshaft position sensor, pins 1 and 2.
Display at 20 °C: 0.8 – 1.0 k Ohms
2. Connect ohmmeter connector part to rpm/crankshaft position sensor, pins 1 and 3.
Display: infinite ohms
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