thats cool...the black box is the Barrell valve..and is properly set with a leakdown tester..( cost 25.00)
those check valves have rubber o-rings on the end of them.you can get them from local auto parts store if need be...but looks the problem corrected itself..
good luck...do you have egt sensors installed ?...the clamp on is easy to install..will help you fine tune it a little better after a full passes...
good luck.
Brian
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Bjuice..
"I'M YOUR HUCKLEBERRY ! "