Steering wheel not straight, rumbling feeling?

[gsxsoul]

So I was on my way to another city (three hour drive) when I noticed that out of nowhere my steering wheel wasn't straight, but the was driving straight. It was about fifteen degrees to the right. After about half an hour of driving it slowly straightened out and was normal again. After about an hour and a half of driving I stopped for some gas, then when I was on my way again it happened again. This time however it only took about five minutes for the wheel to straighten out while driving highway speeds (approx. 120km/h). The problem went away for a couple days until yesterday when I drove it and then the issue happened again. It didn't happen until the third time I drove my car for the day however. Then later I started to feel a very bumpy feeling from the front of the car, as if the road got really bumpy. I stopped and took a look at the suspension, everything seemed fine. I was on my way again and then eventually the bumpiness went away, but once again the steering wheel isn't straight. I have no idea as to what the problem may be and am a bit worried since I'm from out of town and don't want anything to break down on me. Anyone got any ideas? Sorry for the long read. Thanks in advanced

EDIT: should also mention that I was involved in a very minor accident about a month ago. Took the car to a garage and they just said it was a bent control arm and got that replaced.

 

[Blurred Talon]

You need to jack up the front end and check it for wear.
Ball joints, tie rod ends, wheel bearings. Something is worn and causing you issues.

 

[timmy]

Just stating the obvious, but don't drive it until you have checked it over and found what was broken. With the steering jerking like it is, I would say it is most likely the steering rack.