I just got my t maxx 2.5 together after about 3 years of it sitting lol. i got everything ready to go and i tried to start it. It started up but the idle was crazy high ( it actually scared me lmfao ) so i tried to lower the idle but it didnt do anything. i didnt let it run like that for more than 4 seconds because i know thats not good for it. but I'm not sure why it is doin that. is it because my fuel is old? or is there something else wrong?