Hi

I have been wondering. Flying this weekend I did a couple of maneuvers. When I doa, don't know if it's called an inverted loop, but I turn the plane inverted in level flight and then do a loop. When I pull the plane up into the air - just as I get to the first quarter at the top - the engine stutters. It doesn't die it just stutters and as I go down again, exiting the loop, it's fine again.

What could this be the result of? I can pull the plane vertical and let it run without it doing it and I can do a normal loop fine.