Everyone has thier own method of setting up icv but its simply a case of getting a solid idle from cold, hot and avoid stalling under hard emergancy breaking. It can be one of the longest things to setup if its an unkown engine then its trial and error.
If your using ITB's with boostage the way to do it would be to totally block off any vacuum holes nearest the wing side (furthest away from engine) You can get a dedicated 4 or 6 Cyl ICV from Jenvey which is easiest to setup and use.
http://www.jenvey.co.uk/Imgs/Accs/LKT3_m.jpg
http://www.jenvey.co.uk/drawings/index.htm
The one you want is part no DM2/22 for £13
That how you set it up boosted or n/a, you set all throttl butterflys to closed so no air leak then set up idle and things using the ICV only that way you have better control and avoid air leaks, boost creap and other annoying troubles.
To get started say you want idle at 1000RPM you would aim to fully open the ICV when revs are falling around 50% higher revs so 1500RPM is a good starting point, see if you can get a solid idle from 1500RPM down in increments to your target idle speed. Firstly setup AFR then use ignition timing to kick it back in line where needed then rests upto you whatever features your ecu and stuff you like to use to stablise the idle.
Hope that helps get you on the right track.
