vibration when the a/c is turned on

I have a 1998 Ford Escort. When I put on the A/C the motor starts vibrating. I have put the motor mounts, the timing belt, the water pump, harmonic balance, the belt, the shock absorbers, complete tune up including gas filters. I also put the radiator fan when it broke. So all major repairs have been done. Please HELP a HELPLESS WOMAN WITH A CAR PROBLEM AND NO MORE MONEY. :banghead:

Hi there. Does the vibration occur when the vehicle is in park, engine idling, and the A/C on? If so, has anyone inspected the A/C clutch/compressor? You do not mention that in your post. Thanks!