I replaced the control valve and replaced the power steering fluid. When I turn left or right the engine shakes and the wheels shake. It does this while the car is sitting still while in neutral. The fliud is at the proper level and I adjusted the control valve. Any ideas?

 

fraunz, did you ever figure out what caused your vibration? I seem to have the same issue with 1980 vette. It seemed to shake less once I adjusted power steering valve balance but I have not completely eliminated it.

 

I doubt that the OP is still around since the post is 9 years old. Did this problem just show up or did it happen after a change was made?