Hi have this problem as we'll. I first had a pump issue where there was noise and I replaced the pump at first it worked just fine but now I have this issue where the steering is at times stiff and hard to turn and at other times the power steering works usually at a lower speed. I checked for air and I'm certain it's not the oil because I replaced the oil when I changed the pump . I will say that my fluid is a bit over the max line on the reservoir and hasn't leaked. A buddy said it could be the rack and pinion any thoughts on this? Much appreciated .