my little brother just gave me his xtm x-cellerator and i cant seem to get it to run properly, ive been tuning nitro engines for about 3 yrs now and thus one has got me stumped. it starts with ease when its cold, but wont start at all when its hot, when it starts it runs fine 4 a few minutes, then all it wants to do is flame out when it comes down to an idle, and is hard to keep running. im starting to think the engine is rooted, what do u think? thanks