Well, I am not sure what is wrong with the car but going over bumps at speeds greater than 15 mph causes the steering wheel to go right to left very quickly and make a clunking noise. It is fine on smooth roads unless you are turning, then you can feel the slightest play if you rock the steering wheel back and forth. I originally thought it was lower ball joints but upon having those inspected they and every other joint up front was tight as a drum. Right now I am checking into the air suspension, which is the original with over 400,000 miles on it, and possibly the power steering assembly being loose. Any ideas?