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2001 996 variation in idle rpm and tremor

Engine

Vehicle Information: Year: 2001; Body Type: Coupe; Total Mileage: 3900 miles;

I recently purchased a new 2001 996 that had 980 dealer demo miles. It runs great except that I noticed an idle rpm variation along with a slight rumble or tremor of the whole car every 10 or 15 seconds. I took it to the Pioneer Center Porsche dealer in San Diego. They hooked it to their computer and found nothing wrong. I am new to Porsches and I do not know if this is normal for a 996 engine but it does not feel normal to me. There is no "check engine" light on. What is your opinion on this matter? I appreciate your answer.

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