Engine won't stay running
I have a Thunder Tiger MKII Trainer with a GP .42 and when I start it it will run for about 5 seconds, sputter, and then die. Its practically a new engine, I've ran it only about 8 times, only two of those runs have been in the air. The last time I ran it was about 4 months ago and it ran fine. I drained all the gas out (ran it out of the carb too) and put a cap on the carb intake. It sounds like an air leak to me but I'm not sure. Where all do I check at on a plane? I race nitro cars and trucks and this is my first plane, so I don't know too much about them yet. Any help would be greatly appreciated. Thanks!!
Justin