I have a 2004 Club Car with a lift kit and knobby tires. 48 v. I am new to Golf Carts and bought this one from a friend. It goes when you press the pedal most of the time. Some times it wont move and you have to press the pedal multiple times. IN addition, once moveing the cart seems to "vibrate" or hop as if it had a out of round tire. I raised the cart on jacks and spun the tires. One is slightly out but the rest are good. I feel like the motor is the cause. Anyone have a guess?