Ok the hotter glow plug helped but it still dies at hi speed. It will run all day at half throttle. Which is plenty for this Plane “Heckley”. So I put another Evolution 46 on that I know is broke in and runs good. It will fun good at full throttle, but after I fly a wile the engine will cough but not die and when I do loops or rolls at full power it will cough but in a hover or a slow striate climb out it will not cough could the be a foaming issue? The new engine will die but the broke in engine will cough?