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1997 993 Low/Rough Idle

Engine

Vehicle Information: Model: 993; Year: 1997; Body Type: Cabriolet; Total Mileage: 41,000;

I have a 1997 993 w/ 41,000 miles that I purchased in the last year, the car was PCA owned and v.well maintained. Having read all the posts for the last 5-7 years and wanting to benefit from the collective wisdom: The car has a rough idle when warm that mostly goes away when the A/C is engaged and the engine picks up 50-100 RPM. As this seems like a pretty common problem, has anyone been able to diagnose it?

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