hey,,,,,,, my friend Doug had the same problem with his GMS, after 3 guys spent 2 hours trying to fix the problem I walked over and told him to put a larger prop on it,,,, problem went away !!!!!!!!!!!!!!!!!

true story !!,,,, his GMS kept stalling on take off,, I told him he needed to load the engine more, put a larger prop on it,,,, problem gone !!!!

Jim