Ever since i got my 2002 burban i hae had steering issues. At first i had a lot of play in the front end, then we changed out inner and outer tie rod ends on both sieds and the idler arm. Then i got an alignment and this fixed most of the problem with the play in the steering wheel. and about three days after that my power steering pump went out. I got that changed and then I went to the zoo with my family and on the way there every once and a while at highway speeds it would feel like the steering wheel would just go limp and i would have about 4 to 5 inches of play in it but it would go away. It scared the crap out of me. What in the heck is the problem with this truck can anyone help me?