variable speed steering box

Has anyone had a problem with their variable speed power steering on 90s cks? My steering seems to be doing exactly the opposite of what its supposed to be doing , ( slow speed: stiff steering , high speed: loose steering) I have a 95 Z-71 with 150k miles plus on it

I'm having the same problem. I thought the power steering pump was bad and replaced it. Steering worked well for about five minutes. now if you rev it up theris power assist but not at idle.