My ZDZ80 starts fairly easily, and runs ok, but it sometimes quits when I give it quick full throttle (usually, on the ground when I'm heading out to the runway for a flight). This would make me think that it is a bit lean on the low needle, but in the air, it gargles every once in a while at mid throttle like it is a bit rich. It does not stop running when I goose it in the air. Any ideas why this might be happening?