If your front end is off from left to right, the first thing to check is the lower arms and screws. If you have a set of lowered arms on the car, they're probably not the same height. I've had to sand them (caveman fix) to get them to be the same height. The other thing to check is the screws. A bent screw is going to hoze the whole front end.

Also, if you're running brushless, the weight of the chassis will probably be off from left to right. My chassis sets almost a half mil off when it's tweaked properly.