hey guys, im new to gas... been use to nitro planes...

this is my first gas engine, so not quite sure whats up... then engine is built into a Goldwing MX2 - 30cc size aircraft...

this afternoon I did two flights... first time I went invert and when I came out of it the engine cut... this sounds like a fuel
problem, but what can I do to fix this?

2nd run it also cut after some sideways movements... but also it was like the engine was missing... sound like "pappappppaap"

you know what I mean?

any thoughts or ideas?

thanks