i have a gsr swap in my civic and a guy i work with put it in my car after i blew my b16. anyway it has never been right as far as idle. well i was at the local autozone tonight and the guy working wanted to hear my rpm's going up and down. i opened my hood and for the first time i hear a hissing noise. the guy that put my motor in put a vacuum line that comes from the bottom/back driver side of the intake manifold to the top of my adjustable fuel pressure regulator. and on the gsr intake manifold there's a butterfly thing on the same side and i took the line off my regulator and put it on that thing and the up and donw shit quit but my car idles around 2000 now. and i still hear a hissing noise like a vacuum leak. so any suggestion's. my car is converted to obd1 if that helps.