I have seen a Futaba 127DF not work in some airplanes when a Futaba 148DF works fine. My point is some receiver's seem to react different in one plane then an other. The question I have is are all the components mounted the same as they had been with the Hitec? Second is you said something about ignition. If this is a spark ignition the other guy was fortunate using FM. Some people use FM with no problems but my opinion is PCM with a spark ignition.