sticky steering on 1994 Buick LeSabre

have noticed my power steering has been stiff or sticky what may cause this

2 answers
Varying degrees of steering can likely be found in this set of charts. Good Luck with this one. iT seems like they all need a rack and pump just to get it right. https://docs.google.com/file/d/1-1z8rJJCsCjTY4womPuGGayNDHug9BUHV-ewpvbNBDneEPOcR6zkxPg_jgYAdzxClMboQmft_ks-7ZYg/edit?usp=sharing
Steering rack bore scored, needs a new one with a flush. See front end shop for price!