If there is excessive engine vibration, an engine alignment procedure may cure the problem. Loosen all the bolts that go into the rubber mounts. Do not loosen engine or body mounting brackets. With the vehicle safely supported, shake the engine/transaxle as a unit to settle it in the mounts. Re-torque all mounting bolts, starting at the rear and working forward. If engine vibration is not reduced, check for torn rubber mounts. The mount at the timing belt end usually fails first.