Nissan Consult

Hi to all of you micra fans.
Just bought a Consult reader,and wanted to adjust the idle.
And need some help.
So from what i read in the manual i have to chose adjust
idle option and that disables the AAC/IAC valve,and then
turn the idle adjust screw till the desired RPM reached.
Is that right.
Because when i activate the idle learning function,the engine
Drops the speed till 400rpm and if i don't blip the throttle
it cuts out.I think that maybe my idle screw is turned too much to decreasing RPM,and that is why it stalls.But want to
be sure if i do it right.The IAC stays at 40% at idle if that
is some kind of help.The car is holding good idle right now about 680Rpm but some time stall at stop lights.
The car is 96 micra 1.0 GX