92 power steering - desparite for help

[waltweems]

92 LSL PS problem. no assist when car is stopped. Steering wheel jerks back and forth. In motion it's OK. I've replaced the rack with a rebuilt one from a national rebuilder of racks. Had the pump rebuilt. Bought a new control valve
and a new check valve. The pressure at idle is 150 and at high RPM is 800+. I have not replaced the hoses.

I don't know what else to do and would greatly appreciate any thoughts.

Thanks

Walt Weems