I searched a little on this so if it's a repeat, I appologize. I'm having an issue with my Stang not wanting to return to center. It's not very predictable and just irritating. I've replaced ball joints, struts and checked everything for play. It's tight. I've also had the front end recently lined up. It also kinda "self feeds" when turning (hard to explain, I turn and its like the power steering pushes the wheel on over in the same direction and I have to pull back to keep it from going too far). Anyhow, it won't run straight down the road. If I let go of the wheel, it will stray off to either side (usually the side I just corrected from; like if I make a right turn it wants to stray right) so I'm constantly fighting it down the interstate. I was told today that it may be a leaky spool valve in my rack. It's the only thing I haven't replaced. I have 128 thousand miles. Anybody had this trouble?