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2007 997tt Idle creep when warm

Engine

Vehicle Information: Year: 2007; Engine (Size, Modifications): 997TT; Total Mileage: 20100;

Twice now over the past 3-4 months, when I've stopped at a light, the idle will creep from 850 rpm or so to 1200-1800 over 5 seconds or so. It will pop back down to 850 for a second (sometimes by itself, sometimes after I blip the throttle a little), then creep up again. The first time it happened I parked the car and when I went out the next day it was fine. Today it happened again. The car was warm both times. Weird - any ideas?Thanks.

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