My car will vibrate while at highway speed,it is pretty bad I can feel it through the steering wheel but it also can be felt all throughout the car. This occurs at various speeds. All front end suspension seems tight,new tires up front,and tire balance ok. Also car vibrates while at idle such as while sitting at a stoplight but the vibration is less severe. This vibration is making me not want to drive the car. Does anyone have any other ideas what it could be or what I can check? Any help would be greatly appreciated.