Problem sounds familiar

for me on reverse it happens now that it starts shakes...but my problem is that something is wrong with engine or ignition, and when reverse and turn there s more work needed from engine and it starts to work really unstable which causes shaking for me...
dunno whats ur thingy is

powere steering goes hard, is it what u r saying...hmmm does it make high pitch noise when cold? if it does then its probably the o-ring under reservoir is bad.... well its my problem, still have not change it... gonna do it this week...