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2003 996 C4S Low rpm on cold start

Engine

Vehicle Information: Model: C4S; Year: 2003; Body Type: Coupe; Total Mileage: 53,000;

Joel, Over the last 2-3 weeks sometimes when I start the car after it is sitting for a long period of time or first thing in the morning, it will not rev up to standard warm-up rpm (approx. 1200 rpm) but instead will only get to 600 and run rough. Trying to give it more throttle most times kills it (then it starts fine) or it will gain rpm and run normally. Last service was @ 45,000 this spring. There is not a "check engine" light or any other fault indication. What should I look for or tell service manager? Thank you, Terry Davis

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