Anyone wanting to use a external Idle Speed Control vallve will probably need an external Chaeck valve to keep boost from leaking out when boosting. I bought and tested an Anver 1/2" vacuum check valve to do the job, and it so far lets the car idle up to 2k rpms when fully open.
http://www.anver.com/images/components/valves/CheckValvs/08_05/cv12m12f.jpg
http://www.anver.com/images/components/valves/CheckValvs/08_05/cv12m12f.jpg
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