I have a 2010 F-150 Platinum 4X4 and the steering seems to have a tight spot or for example like a detent in the straight ahead position of the steering. When i try to steer it very lightly while going down the hi way it feels like its locked and then it lets go. seems worse when it's cold (-25) and it creates a safety concern as the truck jumps to the left/right when this occurs. Could this possibly be the rack and pinion or????????