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Steve...
It sounds like the crankshaft position sensor (CPS) could be acting up - they tend to fail when the engine is up to temperature.
Use the search function for position in the engine bay and remedies to replace.
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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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