help needed!

bought a new winter car(92 mitsubishi gallant) and im haveing some issues with the stearing! when i have someone move the stearing wheel the flywheele on the pump stops moving or staggers quit a bit… Ive been told it could be a bad pump or a bad stearing rack… Both are fairly expensive parts so id rather not buy both and find out its only the one… Could anyone stop by or tell me a way i can test either one? Im in lancaster… Id even be willing to pay someone to fix it if they would be interested. Let me know… thanks…

sounds like the pump