Engine Mount Control System
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 1998 Acura Integra, 1998 Acura 3.5RL, 1998 Acura 3.2TL, 1998 Acura 3.0CL, and 1998 Acura 2.5TL. 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. Engine mount control system, controls engine mount stiffness at idle. For troubleshooting procedure, see ENGINE MOUNT CONTROL SYSTEM article in ENGINES section.