Section 175 (Engine Controls - Tests W/O Codes): Symptoms: Vibration

WARNING: This page is about a different car, the 1995 Mercury Villager. However, it is still accessible from the selected car via links, so may be relevant.

Check for damaged fan.
Check drive belt components.
Check engine mounts.
Check crankshaft vibration damper.
Check driveline components.
Check for defective tires and wheels.
Check tire balance.