04 Forester XT MT
So i'm a little ashamed to admit it but when i put in the new intercooler i put in a cheesy ebay blow off valve cause i'm cheap. Well a few days ago my idle got funky and i through a lean code. i checked it out and found the stud and nut were gone from the previously mentioned cheesy blow off valve. I plugged it up with some tape and it still releases pressure. i'm going to find a new stud and nut for it but i wasn't sure what the stud does. if it is some sort of adjustment or what. any input would be appreciated.