Welcome, Ed,

Check out this post (and the Fuel Systems forum) for some emissions ideas..
http://www.ca.dsm.org/forums/ubbthreads.php?ubb=showflat&Number=174162#Post174162

You can find boost leak test info and other great resources at http://www.vfaq.com

You should do another test after fixing any boost leaks. The bad CAS could have been causing a misfire and boost leaks definitely don't help.

Make sure you reset the ECU after fixing things and drive around for a good while (including a highway pull before the test, to get your cat hot).

Good luck!