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Sounds (not trying to be funny) like a baffle came loose or there is a hole yet undetected.
If your car has an air pump check the connections from the air rail to the pump, and the connections between the ERG valve and the muffler and air box.
Let us know.
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'94 CMC Firebird Trans Am
'86 951 LS1 (C-2) Gone 
'77 911 3.2 (C-1) Gone but not forgotten.
http://www.pelicanparts.com/MotorCity/marcesq1
http://www.youtube.com/user/958Fan#p/u
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