Ok...first off..Im new to nitro..I bought two xxx-nt's from a guy..one was stock and it works fine..Other has an OS .12 CV engine using starter box...Well i got it to start a couple times but it would rev really high and then cut right back off...Now..I can't get it to do anything now..Is this thing dead?Does anyone know about how much it would cost to have it sent in to be fixed??Or should i look for new engine..Keep in mind i want to race with truck..but in rc pro series that i've been looking at.you can use 12or15 engines...