Whenever I get up to and over 80 mph, my steering wheel will get a vibration to it. Nothing too violent, but definately not from the engine. Im thinking maybe its something to do with the airflow because itll be more vibrating when the sunroof is open and less when Im behind a truck or car and the airflow is cut off in front of me. I understand that with an older car (mine is an 01) these things happen and stuff starts to loosen. Just wondering if anyone else has this and if its easily fixable or something I should be worried about?