I also have a problem with my engine. When I go full throttle and then back to mid, the engine will die. I tried to set my needle and replacede my glow plug still not resolved. Any ideas out there? should I cahnge engine? To give a background about my engine, I crashed my airplane a few months ago and the engine was submerged in sea water for a few hours before I recovered the plane. maybe the piston is corroded? what engine do you guys have prefer for a cheap price and of course would fit with no mods? any help would be greatly appreciated...thanks.