I just bought a HPI nitro MT, it ran great for a few days. The other day i was playing with it and i flipped it over and the engine died. After that i cant get it started. I looked through the manual and put everything back to the factory setting and tried to start it. Well after three days, two glow plugs and lots of sweet i still cant get it to start regularly. Today i did get it to fire up but only when i was holding it at full throttle. If i let off on the throttle the truck dies. I dont know what to do. I am new at this please help if you can.