I guess I'm bringing this back from the dead but I just dealt with this issue after a Perrin turbo inlet install (only threw it tonight... a few days after the install!).
I made a quick blog post with pictures of the problem here:
http://drewstechnotes.blogspot.com/2...oblem-fix.html
Essentially the purge control host got disconnected and thus there was a "gross leak". Super easy fix, tricky little item to see and scary as hell when the code isn't in the repair manual.