We really need alot more info to be able to help you. Like do you have any control, such as steering? Is nothing at all working? What kind of receiver battery are you using? Thats just a start, Im sure there are other questions some of us may need to know to get an idea of whats going on.

EPA is End Point Adjustment--its an adjustment to set how far the servo travels before stopping. Its a good idea to set your throttle EPA to where once the throttle is fully opened that the servo stops, so it does not try to over-extend and damage the servo. Also once the brake is engaged fully to stop travel for the same reason. For steering, most cars can use the maximum setting, but it never hurts to check and see.