Quote from KSheppard :

I got the same problem...going down the straights it's kinda like a really loose tie rod. Also i have to hit [esc] after a race to chat so the wheel won't jerk left/right...Any help would be greatly appreciated!!!!!

I have the same problem also, and i realy cant find any "good" solution, alltough one thing that seemed to fix the thing was just simply turning off my logitech profiler, it doesnt twitch anymore, but i just cant see how this affects the game..

Not sure how helpfull this might be, but i think it might be worth trying atleast