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Worn rubber on motor mounts. Replace mounts.
Kinda sounds like motor mounts. The rubber in the mounts does rotten.
The rubber part is called an isolater.
If you rev your motor and the motor moves excessively one or both of your motor mounts is broken. Visual inspection is the best method for determining the condition of your mounts. Jack up the car and put it on jack stands. Get underneath and look at each of the mounts. The rubber should not be cracked or missing pieces. Push on the motor with your hand and make sure the rubber is not broken and that both sides ( motor and the part of the chasis where it mounts ) are firmly attached.
With rubber motor mounts.
MOTOR MOUNTS Motor mounts should always be replaced in pairs or sets along with transmission mounts. Age, oil and grease cause deterioration of the rubber leading to vibration, chatter and failure. No restoration is complete without new motor mounts. Motor mounts (engine mounts) are used to connect a car engine to the car frame. They are usually made of rubber and metal. The metal portion connects to the engine on one side and to the frame on the other. The rubber is in-between to provide some flexibility (so engine shake doesn't cause the car to shake). Newer cars may use slightly different mounts; however, their purpose is the same. Provide the connection from the engine to the car frame. The number of motor mounts varies from car to car. The motor mounts are located in most cars / trucks on the frame just under the motor. Hope this helps
The bonded rubber is probably ripped, replace them.
This you could get away with for awhile without further damage. Motor mounts have a built in safety device to keep the engine in place when the rubber mount breaks.
is there a way to fix or replace just the rubber in the mount
When an engines motor mounts go bad the vibration is felt throughout the entirety of the car. The motor mounts should be inspected to see if the rubber inserts are cracked.
It could be a bad motor mount or mounts. Motor mounts have rubber in them and go between the engine and the frame. Over time the rubber gets brittle and wears out, causing the engine to shake.
Transmission mounts are they considered motor mounts? After saying that how many motor mounts do I need to replace, if I change out all of them.