I have done range checks on the ground with the plane running and not running with a data logger on it and it shows nothing one test I did do was I had my buddy hold the plane with it running and I walking a good 1/4 mile away and the throttle servo was working fine but once I take off and do about 2 laps around it starts to act up I will check my spark plug cap again but everything in my plane is new the engine is not even broke in yet </p>