I have the power trainer .46, never flown yet and it runs good for 1-2 minutes at 1/2 throttle then starts slowing down and suddenly cuts off. I'm running wildcat 15% nitro with 16% total oil and stock plug. My garage is 32 degrees and when I open the door it's 19 degrees outside. The needles are at stock settings and the tank 3/4 full. Could it be the high speed needle? When I open it to 1/2 throttle or better I don't see any bubbles going to carb but fluid coming from exhaust back to tank(drops of fuel?)