This sounds like you could have a problem where the engine is in limp home mode.
"986 S problem at idle, engine won't rev and shakes, battery disconnected"
The above post from earlier this year (do a search) which turned out to be bad fuel and / or setting the engine ECU with less than 30% full fuel tank.
Hope this helps.....
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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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