I drive a 2002 Chevrolet Trailblazer. Why does my steel wheel jump all over the place when I hit a few humps? I changed the front and rear bushing on both sides. Some people tell me it might be the rack and pinion and some people say it might be the knuckle before entering the rack and pinion. I haven't got a wheel alinement. Should I get that done first and see if that is it? Email me if you have any suggestion?