Is there a vacuum line diagram anywhere in the factory service manual? I couldn't find it in there anywhere. Swapped from TBI to TPI so the sticker on the hood isn't helping, and a search resulted in a bunch of posts where people said to search

 

The service manuals don't have reprints of the diagram under the hood, if that's what you're asking. If you look up each individual component, you'll find diagrams that show where all the hoses go, but there's no single comprehensive diagram. Some of the Chiltons Total Car Care manuals have basic drawings of the under hood diagrams.

What vacuum line are you having problems with?

 

Source material is the 82-92 Firebird Chiltons Total Car Care manual... They aren't much better quality in the book.

 

Yeah, thats pretty much what I was looking for. That last picture you posted is exactly what I needed, thanks!