[Wret]

I've been observing a rocking motion as the car drives over slight irregularities in the road surface, such as seams in the asphault. I'm not sure if it's getting worse or I'm just more attuned to it. It's especially evident when driving over sections of road where the lines have been ground out. This feels like I am oscilating the steering wheel half an inch or so and at the right speed the car rocks dramatically.

Otherwise, there does not seem to be any looseness in the steering as might indicate worn tie rod ends or ball joints. The car does not randomly take off in one direction; rather it moves, then comes back. The motion does not pull on the steering wheel.

Anyone familiar with these symptoms?