87 5kcsqt not passing emmisions...HELP!!!

[Tim Sidders]

Hi all 
I have a 87 5000 csqt with a hoppen chip that passed emissions last year with flying colors...this year it failed miserably on both the HC and the CO tests. The max allowed on the HC is 220.00 and my car was 682.00, the max allowed on the CO was 1.2 and the car measured 7.3. I have just completed the input and output tests according to SJM's site and no faults were found. I am a little stumped here. The car runs and drives fine. I have noticed that the max boost has diminished a little... I used to get  16-17 psi all the time and now I can only muster 15-15.5psi...the boost used to spool extremely fast from 10-17psi, as soon as I would pin it ... the gauge would shoot to 16-17psi... now it slowly builds to 15. Could there be a vacuum leak somewhere that is causing the rich mixture and the boost problem???Or is it my imagination???Thanks in advance 

Tim 
87 5kcsqt 
91 200 20v
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