I have a '93 400E. My girlfriend recently took it over some very rough roads and hit some large potholes. Now the right rear tire seems to skip and skate all over the place when it hits bumps. The whole car jerks and the rear end seems to kick out to the left. I have pulled off the tire and can find no obvious loose or broken parts. Everything seems pretty solid. I'm assuming that the rear shock is just bad but I'm not sure. Any suggestions on what else it could be?

Any help is appreciated.

jerry