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From what you said its unclear if you can replicate the vibration when the car is stand-still. You did mention that the vibration occurred when "you finally drove" the car and noticeable at 3k. Like I said earlier I am not a expert but you may want to consult one to rule out drive line and suspension. To my knowledge those can equally cause pretty nasty vibrations.
If you can replicate this vibration when parked, at 3K, then like BYprodriver said... a slightly out of balance flywheel sounds reasonably accurate here
Luck2u there
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'97 Boxster base model 2.5L, Guards Red/Tan leather, with a new but old Alpine am/fm radio.
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