'07 cobalt, 60K miles. No ABS or Traction Control. Electric power steering.
Doing slow turns in a parking lot, with mixed snow/ice/dry pavement, the steering wheel jumps around. Not a lot, but noticeable. AFAICT, this doesn't occur when turning on dry or uniformly slick/snowy surface (today, for instance).
Watching from behind while the car makes these turns, I can see the tires' direction angle abruptly change (jump) as they go between dry pavement and patches of ice.
I don't feel any play in the wheels, and the steering seems tight. The struts seem OK when I bounce them, and going over 2" blocks in the driveway. Regular road tires (not snows). Tread is OK, certainly legal, and wear doesn't appear to be unusual. I replaced the rack and steering shaft, and the control arm bushings last spring.
Any insight appreciated. Thanks.
Update, 1/9/18: After more careful inspection of the front tires, I decided the wear might be uneven after all. So, I adjusted the toe out by 1/2 turn on ea side. Conditions yesterday were right for the problem to occur, and it did not. I'll do more testing before calling this an answer.