4 Door a bodies, ASSEMMBBBBBLLLLLLLLEEEEE

Yikes! that doesnt sound good at all! Have you found the problem?
Even at a good speed I can let go of the steering and continue in a relatively straight line depending on the crown in the road... and of course the potholes and crappy cold patch jobs on most of our crappy roads here lol

The only times I have had that happen is one tire in the back is low when I have a lot of weight in the trunk, bad tie rod end, bad idler and pre allignment after changing ball joints, idler and due to a different height after changing the torsion bars.