Need help on adjusting idle

[emmaamme]

I have a Yamaha f90 4-stroke fuel injection outboard motor. How do you adjust the idle? My idle is too high and then it will drop suddenly while in neutral and dies off. In order to keep it running in neutral, we have to play with and lift the fast idle lever.

[rodbolt17]

you DO NOT adjust the idle on an EFI 4 stroke.
its broke.
lets get it fixed.
but there is NO idle adjustment.
dont even think about playing with the air valve screw.