2003 base nissan 350z-immaculate condition except for a driver's side window that may be possessed by satan! Initially, when you would park the car and walk away, the window would roll down about halfway. Now, when driving, the window will not roll down, it will roll down halfway and you have to beat the door to get it to go back up, and other embarassing things like that. I'm thinking it has to be the motor, but I wanted to make sure.