Are my engine mounts Bad?

From my experience on 5.0's, you could put the front of the car on jackstands and then jack the motor up by the harmonic balancer. If the motor moves up without the rest of the car going with it, they are bad.

If you're lazy and have an AOD, you can pop the hood and have someone watch your motor as you switch between reverse and drive while the car is running. The whole motor will shift and flop around if they're bad.
 
look under the front of the car. If your oilpan is sagging below the crossmember then your mounts are shot.
 
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