RCU Forums - Possible air leak?

So I'm attempting to start my G3.0, been through about 6-7 tanks so far. Upon cranking it will start for about 1 second, and then fade away and shut off. Also, the exhaust pitch is a little different than it was before when it was running okay. It's tuned, air filter is clean, fuel lines are flowing fine, and I can't figure this one out. The only thing I can conclude is that it's a possible air leak, but I have yet to find any cracks. Another thing, when it does start for that one second, it lunges forward, not very hard, but the clutch is engaging for some weird reason, when the carb is only open about 1/4. I cannot connect the clutch issue to an air leak though, could it be a separate prob? This issue pretty much came overnight. Never had this happen before, has anyone else?