Hello all! First post here, great place, thanks for having me!

Anyhow on to the topic.

I have an '87 Suburban V10 w/ a 350. I have what looks to be a missing vacuum line on a small electrical black box mounted near the throttle body.

In the picture below you can see the vacuum line on the top of this piece going to the EGR valve, and under neath that hose there is a nipple that looks like it should also have a vacuum hose on it.

Can anyone tell me what hose should be attached here and what it leads too? Or maybe it's supposed to be open like that? Any help at all would be great, thanks in advance for any help.