Dear All.
What can be the reason that my YS-110FZ almost shutdown whenever i move the throttle stick back to idle at once ?

if i move it slowly then it's ok, and it also seems to work ok after 3 - 4 minutes on the air.

in the overall i can say the engine works ok in all rpm range, and it has also stable idle. the issue bother me as if i forget to move the throttle back to idle slowly...
then the engine may cutoff.

Regards
Shlomo.