Engine vibration felt in seat when revved between 1200-1350 rpm

2.0 d4d(diesel turbo) toyota corolla vibrates when engine revved between 1200-1350 rpm. What could be the problem? Thank

​ Hi. I have a 2.0 d4d toyota corolla and when the engine is revved between 1200-1350 rpm it vibrates a lot that the vibration iss felt in the seat. This happens while driving and at idle. What could be the problem? Your assistance will be highly appreciated

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check for broken motor and transmission mounts first