Ok so last race I was in the main and about two laps into it my buggy took off like a rocket, full power and someone finaly stoped it. When I got back to the pit me and some buddys were looking at it and it looked like the plastic servo horn skiped a few spots and locked the servo in a full throttle position. So I went out this week and bought a metal horn, as I put it on and powered the buggy up the servo is locked up. When the car is powered off the servo moves freely. Does this mean my servo is shot? Or am I just doing something wrong. We are going to race this weekend and I would like to figure it out before we go. Thanks