[Quicksilver]

Checked the injectors and they are good. I did get them tweaked so they are all flowing spot on. (One was 1% off and another was 2%...)

But while I was in there I discovered that the intake manifold bolts weren't to torque. #4, #5, and #6 were probably at about 5ft/lbs. Torqued them up and had a good think about why this would effect a port injected car like this. My knee jerk reaction was that the gas was squirted in that intake runner so it shouldn't make much difference if the air comes from the butterfly or from the port leak...

...
Discussed the injector timing with Loren and learned some surprising things. I knew that #1, #2, #3 and #4, #5, #6 were on 2 separate wiring circuits which always made me wonder how the timing of the injector worked out. Turns out that ALL of the injectors fire at the same time and there is no timing of them, other then to insure that they go off once per cycle.
A little more noodling and I finally realized that a vacuum leak would allow the air/fuel charge to be drawn out of the intake runner into one of the other cylinders.
Voila... If the timing happens to be right for that cylinder and the injector fires quite a ways before the valve opens, you can get a massively lean cylinder at full vacuum while an adjoining cylinder is rich.

Cylinder #1 still isn't operating at idle so I suspect the gasket is just plain toast. Checked the wiring and the harness has continuity. I guess I'm going to get the perfect opportunity to steam clean the top of the engine and to replace the fuel lines...