I thought maybe his throttle servo jammed but when I was playing around with it afterward I found that where the throttle linkage hooks up the clevis was hitting the engine mount which wouldnt allow it to move back any further than half open( and no it was not doing this at all on the ground before). So I told him he would probably have to take that clevis off and just bend the rod 90* to get it through the hole and then bend it the oppisite way so it cant come back out. Besides the bumpiness this was a much larger and more open field than the one at the club I'm in. I actually cant wait to tell my instructor about it, He kind of gave me the green light at the end of our last session but I planned on using my plane at the club field but I wouldn't change a thing now.