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Erratic idling

Engine

Vehicle Information: Year: 2000; Total Mileage: 9500;

I have a problem with my Boxster idling, the engine when warmed up will rev at idle from approx. 1100 to 200 rpms. The check engine light is always on. When the engine is cold (shortly after starting) it seems to run OK, but after it warms up (only after a couple minutes) the idle problem starts, and there is a huge loss of power. It was stored inside heated. I called the dealer and service suggested putting a can of fuel cleaner in the gas. Which I did but did not help. There is no excess smoke from the exhaust. Any suggestions (service is scheduled in 2 weeks)

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