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Vibration @ 2K RPM

Engine

Model: 944 S2, Year:1989, Mileage:11400, Type of use:Street use only
I recently purchased an '89 944S2 with 11.4K miles. The previous owner had the timing belt, balance shaft belt, tensioners and idlers replaced at 10.9K at a Porsche dealer in '05. The car idles fine but I notice (under no load) a slight vibration between 2000 and 2200 RPMs then it disappears. I understand the belts are re-tensioned after 2,000 miles. Is this vibration characteristic for these engines or should I be looking into this issue right away? Understand that bad motor mounts can also cause vibration in these cars. Thanks,Jim

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