Easy to check with a friend (or if you can see your motor from the driver's seat with the hood up). Put car in drive (auto trans) and slowly press the gas pedal as you keep your foot on the brake to keep the car from moving. If the driver's side motor mount is shot you'll see the engine lift up. Put the car in reverse and repeat to check the passenger side. With a good emergency brake you can do this with a stick also. If your E brake won't hold the car, then it's a bit trickier. Either way, make sure that there's nothing in front or behind you when you do this.