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Terry - you really must take the car to a REPUTABLE Porsche shop or main dealer and leave the car with them to diagnose the fault. A standard (non Porsche) OBD reader will not be able to track down certain problems.
As the others have said, it could be something simple like a fuel pump or spark plug / coil pack but without knowing what the Duramatric / PIWIS tester reads, you will be chasing your tail....
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2001 Boxster S (triple black). Sleeping easier with LN Engineering/Flat 6 IMS upgrade, low temp thermostat & underspeed pulley.
2001 MV Agusta F4.
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