Power steering control valve
There is a little stub sticking out from inside the PS box under this valve that moves back and forth when you turn the steering wheel and controls a spool valve inside this valve that determines what side of the power steering chamber to send oil pressure to. If it's off center or stuck it can do crazy stuff. Mine is sticking and I've polished and polished and just can't seem to get it to operate smooth. Thought I had it but the other morning I went out and started the car and good thing I wasn't holding onto the steering wheel cause it started spinning to the right as fast as it could.
