I'm experiencing a tire wobble in my Cobalt and my steering column wobbles when I have the steering wheel perfectly straight. It goes away immediately when I turn in either direction, and it tends to wobble worse when the car is cold. It is especially bad on bumpy roads, and it takes effect about 20mph and higher. It sounds like it is on the drivers side of the vehicle somewhere in the steering column, and there are no fluids leaking on the ground. This problem has persisted for months and the last time I took it in they charged me $900 to fix something with the axle and (if I remember correctly) they did something with the tie rods, but none of that fixed my problem and it is getting persistently worse. If anyone can help identify the problem, please help me out! Thanks!