Not if the LS needle is on the verge of being too lean, in that case it will just quit, now as to quitting after stumbling when opening the HS needle, my guess that the HS needle is too rich. Try this when opening the throttle, (with glow juice attached), when it starts to stumble, lean the HS needle very slowly. If it accelerates, open throttle some more, if more stumbling occurs, lean some more until it will run at full throttle. Now, remove glow power and find peak, leave it at absolute and go back to fine tune LS needle. Now richen hs to your favorite flying setting.