Mixture control Spit?

[DoolittleRaider]

Today I got the Mixture keys (Increase and Decrease) to work...but not consistently. I cannot adjust Lean to Rich before engine start...it seems that I cannot get it to work until after take-off.


I occasionally get this ERROR message, below, when I first hit the "Decrease" Key:

ERROR: Hiermesh:
Can't find chunk
xLampFuel

It seems to occur at my very first attempt to change Mixture from lean to rich (nothing happens). However, when I hit decrease key and then the increase key a second time, it seems that it does now usually work, going to Rich.

Very frustrating as my many trouble-shooting trial and error attempts to figure this out don't seem to come up with consistent results.

I'll keep trying. I'm understanding anthropomorphic option better now....I am thinking that may lie at the heart of my problem...Maybe!