Usually It's torn or broken. Some are liquid filled and will leak. To check: Open hood so you can see the motor, start motor, keep your foot firmly on the brake pedal, put car it drive and give it a LITTLE gas and see if motor lifts or moves excessively. do the same in reverse. If it jumps around you know you need mounts, don't forget to check the trany mount also. Most mount problems are caused by oil leaks that rot out the rubber mounts.
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