that line fell off of something ive never seen a booster suck air from a hose of anysort unless it was directly hooked up to a solenoid or valve.. get a drop light and have a look around the area of that hose it most likley fell off its fitting and the air the lack of opening and closing that particular part has cuased your idle to go to crap....
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you know your not paying attention when this happens:
<div class='quotetop'>QUOTE</div><div class='quotemain'>Are you refering to his Signature? oh shit, i just remembered i used my name in my sig... I just 0wn3ed myself. </div>