mac , yeah fourdrinie ,I just looked that up , it's on my car too - comes from a P.R.V.R. solenoid (Pressure Regulator Vacuum Relief solenoid) going under pass. side snorkel 10" near T/Body .Ya gotta try everything but , not to be crass , mine has come off repeatedly ( although I don't have an EGR -not Callie -Callie w/egr more complex?) And I never knew what it did ,for no performance difference ,in my case, connected vs fallen off
But he's gotta eliminate all this "easy stuff" ??
G T 2/23/2018