have a hissing sound
#2
could be a million things by that description. There are lots of small vacuum lines around the intake box, a few big ones as well. I'd check them all with a bright light. If it was fuel or coolant you'd see or smell it.
#3
more info? Gutted airbox. kn intake, random crap intake will all make noise. If you have a stock airbox then I am sure you have a loose vaccum line OR PCV line is corroded out from the oil coming back through it...change PCV valve&hose
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