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Discussion Starter #1
My car 2006 pontiac g6 v6 (just bought it)has a knocking noise at high rpm and i noticed this green cap looking piece is missing off one of the vacuum hoses. Can anyone tell me what it is and would it cause this type problem? Hope it will let me post a pic...well it wont. But its a little green cap at the end of a black hose and mine is missing. Any ideas?
 
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