I have a 2008 f-250 5.4L gas truck that i am having steering problems with. It sporadically becomes resistant to turning the wheel, i'll be driving down the road just fine and then all of a sudden i'll go to make a micro correction and the steering wheel won't go in the direction i want it to go in until i give the steering wheel some extra force to over come the resistance, then it will over steer and i have to correct back again. It will do this for a few minutes then it's fine again, it also isn't in any particular direction or anything. Sometimes the resistance shows up when i'm turning the wheel farther to make a corner too. I'm not sure what could be causing this, may be some debris inside the power steering pump? Anybody ever have this happen or know what it could be?