I have a new Evolution 46. It will idle like a dream jump to high speed. Run at high speed great and then quite if I don’t cut the throttle back. Once I get it to run good at high speed I lift the plane up, runs good tip it down the engine wants to die. I tipped it down and adjusted the high speed needle until it ran good, tip it up the rpm changes but still runs. In flight it will run good all day at ½ throttle. At high speed it will run for a short wile then quite if I don’t cut it back to ½ throttle. Could this be the glow plug?