Could be your clutch. Some cars have had leaking/bad rear crankshaft seal. That would leak oil onto your clutch.
But I think it might be more of an ignition miss. When our cars misfire the whole car shakes. Almost like your driving on square tires instead of round ones. IF its a mild misfire.. it would be subtle.
Either way I would have it checked out. Have your dealer check for any shadow codes - those won't show up on your key fob... have them read the car's dme memory. Only "hard" codes are stored on the key fob.
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