take the steering servo horn out, then turn the radio and truck on, make sure the steering servo is on the center position while it's on, also try to put the setting of the steering servo in the radio on default, then put the front wheels in the center and without moving them just screw back the servo horn, then start making adjustments with the EPA in the radio (End Point Adjustment).

I hope I explained myself well, I'm from Mexico and still having trouble with english