Cadillac Repair: 1998 Catera, air plenum, manual haynes

Question
I just bought a 1998 Catera with 131K miles on it.  My wife loves it, but it is different than most GM vehicles I've owned before.  I realize it's an Opel, but I'm a rather savvy auto mechanic in my own right and assumed I could repair most things myself.  Problem is I don't have a manual for the car and it started missing yesterday.  I replaced the plugs and wires, and yes, I figured out that I needed to remove the wipers and the plastic cover at the rear of the engine compartment.  They didn't make this car for the mechanic did they?  I got everything replaced, but it still misses.  I'm pretty sure it's the coil pack, so I'll replace that this evening.  In the process of wrestling the wires out, I would occasionally pull a vacuum hose loose.  I quickly hunted down its location and reinserted it for fear of having a sensor go nuts upon cranking it.  There is one hose on the aluminum air plenum (one of four; second from the passenger side) for which I cannot locate a proper destination though.  I've searched and cannot locate a port anywhere.  However, I also found a disconnected hose which appears to come from the tranny.  It's a different hose type, but same ID.  I figured the two must go together, but I'm not 100% sure.  Is there a hose diagram for this engine in the shop manual?  If so, where do you get a good shop manual?  Haynes and Chilton don't have one.  The car has run very well up until yesterday, but I wonder how durable it all is.  I've never seen so many plastic hose junctions on a car in all my life.  It's so easy to pull something loose without trying - makes me wonder if one will crack, melt, or dry rot over time and be impossible to find.  This car must have cost a fortune to manufacture - these hoses and fittings have to be assembled by hand - can't get a machine to do it.

Answer
The line that comes from the transmission is only a VENT for the trans and it is not necessary to hook to anything just attach it to the firewall.

As to vacuum schematics there are none in the factory service manuals. There are only speratic pictures throughout the books.

If you could take pictures of these lines, close ups and whole engine pictures, I might be able to ID them. E-mail them to: onlineautohelp@msn.com