90 350 TBI Vacuum Lines

[Stringer]

Newbie here. Again. Recently bought this Suburban and will replace EGR later today. But there's a T'ed line from the vac tank. Don't know where it oughta go. Everything seems plugged in. Just got a service manual but don't even see this type of vac tank in the book - and no vaccuum line map. (Maybe it's in the emissions manual.) Symptoms: Runs fine...no defrost, brakes are grabby.

Thanks in advance. Oh yeah...I didn't pay extra for the custom painted valve covers and block! I hope.

I think I've figgered it out. I have a 72 with the same TBI set up. I ain't that sharp, but I was able to copy enough of the plumbing to hook it up.