I recently purchased a 1994 Z28 convertible which I love. the only problem is when you drive it on bumpy or hilly roads instead of just the up and down motion you'd expect, my car kinda rotates. when you hit a dip the car dips, then moves to one side, then rises as it moves to the other side. What could be causing this? I am in the process of replacing the lower rear trailing arms. Any other ideas? This is my first Camaro so any help would be greatly appreciated!

 

I would get the car up in the air and inspect the entire suspension. Could be the panhard bar in the rear, broken sway bar end link, etc.