328/Mondial Vacuum line diagram, anyone?

Anybody out there have a diagram of vacuum lines for the Mondial 3.2 or 328? The car is actually an '87 Mondial, but I'm thinking that a diagram for the 328, or even a later 308, would be helpful.

I'm trying to chase down some very poor running, and a dislodged vacuum line remains a top contender after replacing the caps, rotors and wires. My Mightyvac shows 9"Hg at idle, which seems way too low, and a vacuum leak is probably the best explanation. It wasn't running this poorly until I replaced the front cap/rotor, which certainly could have involved dislodging a line as I tried to figure out how to remove the cap. I've gone through all the lines I can find without discovering a leak, but with this car, I just wonder if there is one hiding somewhere...

Thanks in advance for any help.

Peter