I'm new to nitro and I'm having problems getting my engine to run. I have a xxx-nt with a picco .12 on it. The truck is used and the motor is broken in. The guy i purchased it from was using only 10% nitro but i bought 20%. I adjusted the carb to recommened factory settings. I have to plug the exhaust port on the muffler to get it to start. I checked the fuel lines and they seem to be free. When it starts it will idle for a few seconds then die. I kept trying, and it would idle a little longer then it would let me ease the truck around for a second then die again. The last time I tried it started and then then it reved really high constantly( enough to engage the clutch and move the truck!) I would appreciate any help any of you could offer thanks! If I left out any needed info that would help, let me know!