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I don't know about Porsche but in Land Rover the immobilizer does not disable the starter just the fuel pump as does the inertia switch. That being said I feel for you chasing this gremlin around.
Have you verified with a test light or multimeter that you are getting electricity to the fuel pump?
Have you checked the fuel pressure sensor? It shuts off the fuel pump when sufficient pressure is built up in the fuel rail. If it is faulty then the pump may think that it has pressure and not turn on.
When the vehicle ran poorly before konking out, it could have been using the fuel in the rail until it ran out of pressure to the injectors.
let me know what you find.
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