I own a 1995 Ford f150 XLT Eddie Bourer edition. When I was driving it I turned sharp once and my steering got real tight like I didnt have power steering. That went away and I had my easy steering again.Now it comes back every once in a while just while I am driving. Well about 3 days ago it came back. It's been back for the past like 3 days. Maybe more. It's weird my steering will be fine and loose one minute then all of a sudden when I go to turn it's tight. Then sometimes when I am in a turn and it is tight it'll like break loose and become easy again. It also sometimes does it when I hit my brakes and go to turn or when I stop at a red light or stop sgn and then go to turn. I did ajust my steering box, but that was back in June and I didnt have any problems. Tonight I checked my steering fluid and it was full. I also checked all tie rods and everywhere things connect for the steering and nothing seems to be catching.It also does it when the truck is just sitting there not moving at all like if I go to turn while its sitting in my yard. What do you guys think the issue is ? Thanks for the help !