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Pull your motor mount....What you described sounds (to me) exactly what I experienced on a 1998 Box that I flipped years ago. The car ran great but seemed to have a 'rough' idle, along with a vibration ~3K rpm. Thing was, tac wasn't bouncing around at all. After changing plugs, cleaning maf etc with no change, I finally got around to replacing the mount. It felt like a new car.
I've done mount on other Boxsters as well, some of which had vibrations to a certain degree. Every car had a torn mount.
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