hello my car started to vibrate today for some reason. it does it when it is rolling. i forgot to check if it did it when the clutch was pressed or not. i do not think it was the motor.is it likely that a wheel weight fell off or a rear brake drum is warped. it did not seem to get worse when i put the brakes on but i really don't remember. i have a short memory span. this is a project car so the wheels and tires are not in to good of shape. no bends or warping but maybe a bad spot on a tire or junky wieghts.