I have a DA150 with two KS mufflers and no matter what I do I can not get the engine to run consistently in the mid range. In normal flight the engine is pretty faultless. On the ground the pick up is awesome but as soon as I go to prop hang or torque roll at 1/3rd the half throttle the engine will not settle down. It either drops RPM or races up as I put a bit of throttle on. I just cant get the model to stay still when upright. Does anybody have any suggestions as I am going a little mad here
Thanks for your time
Regards Al