R/C Pat, I am using a 9c radio with a 8 channel pcm Rx. Throttle servo is a 425bb Hitec. Ailerons are 5945mg's. Rudder is a 8611. Elevators are 3421 JR. I have a new 2400 mah radical rc battery. When this plane acts up I have full control of all flight surfaces except throttle which comes back after a few seconds. Engine is a BME 50. I cleaned carb and installed new diaphram and gaskets, installed new fuel lines, cleaned fuel filter, and installed new spark plug. I just dont want to loose the plane because of something stupid.