" What would you recommend I do with the wire...remove it?? Right now I have it wrapped around the fuel hose along the firewall just to keep it out of the way."

That is about as good a place as any for now. I would not cut it off at all, just isolate it and wrap it in the harness. If you decide you want it gone, don't cut it until you are absolutely certain of the intended function.

"It clicks as soon as the throttle pully is moved off idle."

Microswitches can fail with a high internal resistance; they sound like they are working but to make sure, put an Ohm meter on it and watch it change when you open the throttle. One other thing, there are two switches; idle and wide open. Make sure both are working and the wires are where they belong.

"There is no hose attached to the grimy nipple at the bottom of the cannister, only at the top."

That sounds right. See the drawing below.

"What do you feel would cause the meter to buzz on every other circuit of the ICU connector when probing the engine side GN/W pins?"

Take a look at the second image below. Just lifting the connector from one injector allows a path through other three to the Y-R wires supplying them on the other side of the solenoids. From there, connections are made directly through the Idle vale to PINS 10 & 23 of the ECU, to ground through the pumps and the O2 sensor heater. All three of those devices are basically turns of wire to ground. From ground, through various sensors and actuators back to the ECU. If you look at the display on the DVM when you check for continuity, you will probably see several hundred Ohms rather than a direct connection. The buzzer still works on most meters up to at least 1K Ohms.

In order to check the GN-W wires, you need to lift all four injector connections. Now you can measure each one to PIN13 without sneak paths for current.

For reference here are some cut-n-paste images from a couple of the Green Books. BTW, what they are calling a "Breaker" is actually the TPS (item H) and associated switches. This is from a Prelim copy of the FI Green Book:





--
Mr. Shannon DeWolfe -- (I've taken to using Mr. because my name tends to mislead folks on the WWW. I am a 51 year old fat man ;-) -- KD5QBL