Its known that the idle adjustment screw doesn't do diddly squat if the main adjustment isn't right. Leave idle adjustment alone, fine tune with that later. Adjust the main rack first, that controls the most amount of fuel. This is the one behind the Allen screw. When you insert screwdriver turn and push very lightly until you feel it insert into the notch, then turn it left. You will feel when it grabs, that's one click, so on and so forth.
RStarga mentioned the Microswitch and is spot on, if it is broken it can cause fuel to shut off when you are coming to a stop sign and not turn it back on at the specific RPM. This happened to my car last summer, disconnect it, then drive it before you go any further.

If you haven't been following this thread, its worth a look.

http://forums.pelicanparts.com/porsche-911-technical-forum/930796-mfi-lean-coming-off-idle-then-rich-again.html

Press on the idle adjust and turn up to 180 degrees in either direction and you will feel it engage. Keeping it pressed and turning you will feel it click, there are about 12 clicks per 360 degrees. The idle is the last final adjustment to do after the main adjust under the hex screw. Make sure you keep a note of any changes made so you can return to the original settings.

Thank you so much for your kind advices.
Your advices are very helpful.
I am starting to fix the trouble of my car following the Bosh CMA manual step by step and your suggestions.
To fix condition for my car by myself, I’ll love my car more.
Regards,