Well ,with my experience ,that problem could be caused by two different things ,one is too lean on the low needle setting ,
an two ,too rich on any setting ,to see if it is too rich ,there would be an over acessive fuel coming out of the engine ,if so ,
slowly lean the engine on Hsn a little ,an see if that helps keep the engine running ,if so ,then the engine settings are too rich
causing it to bog an die when stabbing the throttle!
If your engine is way out of tune ,then you need to find a engine tune thread ,there should be one on the forum on
how to tune!....