Hi Tiamet,
You need to give a more thorough description of what is happening with your car.
Most on this tread have a vibration caused either by a bad [rubber] tranny mount at the rear of the gearbox, or by a bad mount at the centre UJ on the propshaft.
The prop shaft does not rotate when in P. Therefore, if yours is vibrating in P, then this can not be the cause. There can be a number of reasons for it, bad plugs, bad fuelling, bad electrics [one bad plug coil being a highly likely suspect], but if happening in Park, is more likely engine related.
Joe
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