"how does current idle compare to regular idle...if the vacuum leak is constant it will still have a smooth idle"
Idle seems the same as always, haven't noticed a change.

It has the diagram on a sticker under the hood. It's a little difficult to follow (and see without glasses!). That may identify some of the switches.

I've got to get a reading on the fuel pressure somehow. I wonder if the Scangauge can test that? It looks like it does a lot more than what the instructions show. Did I mention the spark plugs looked normal? No indication of running rich at all. Nice slight tan deposits on all the plugs.

"That hose you reference does it then branch off to the EVAP canister?" I don't think so, but will have to check again in the daylight. I only remember it teeing off to the throttle body area and a switch at the top of the a/c condensor.

"Firstly, Check the check valve" Will do that too. As I thought about it last night though, I was thinking that maybe this line did not get it's vacuum from intake hose but instead it is make-up air for an IAC valve. In other words, it doesn't need vacuum, but it does need filtered air. What do you think of that?

"Check the brake vacuum line, odds are it is plugged in, but if its not you find it!" Looked yesterday and both ends are fitted.

"Finally, have you driven it a bit yet?" About 60 miles so far and the light is still on.

I saw a link to a home made smoke machine in another post and am thinking of giving that a try to find any vacuum leak. Any comments / thoughts about that?