I am experiencing an occasional hiccup while in cruise and more often during a decent under power.  I am pretty certain that I saw a comment on this previously from Tracy but I have not been able to find it.  Can someone set me straight on what to do about this?

 

My mixture graph is not working and I will be sending the EM-2 to Tracy as soon as he returns from Colorado.  I also show a true airpspeed of 22 mph in the hangar and it seems to be about that much or a little more in error in cruise.  I don’t think I can calibrate this item?

 

Bill B