Engine Mount Control System
WARNING: This page is about a different car, the 2004 Acura 3.5RL, 2003 Acura 3.5RL, 2003 Acura 3.2TL, and 2003 Acura 3.2CL. However, it is still accessible from the selected car via links, so may be relevant.
Excessive engine vibration could be caused by a malfunctioning engine mount control system, which determines engine mount stiffness at idle. For troubleshooting procedure, see ENGINE MOUNT CONTROL SYSTEM in appropriate article in ENGINES.