Sitting at a light I often feel a vibration that feels like the engine and or transmission working back and forth. Is this a sign that the motor mounts or transmission mount needs to be changed? I've been playing with my pressure washer and cleaning up the leaks. I would like to take care of this vibration too.

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My Daily : 96 E-300 Diesel with 195,000 miles
Retired: 92 300D 2.5 T 345K miles and for sale
Retired: 95 E320 157K miles and currently parked with blown engine

Both retired cars are for sale as is my w124 shop inventory