Well, having read toys4me's post and considering I often drive in hot weather (the whole reason to have the A/C working properly!), I decided to keep the pressure regulator VSV.
For the idle up VSV, I went to the junkyard and found a suitable replacement. I found a 3.0 V6 4runner, which had a group of VSVs attached to the passenger side fender. Although there were several 3.0 V6 4runners at this junkyard, only one had a VSV with the same electrical connector as the one on my 22RE.
Here is where the idle up VSV is located. This is the part that was faulty:
I bought the replacement at a local junkyard. They didn't know what it was and wanted $25 for it. I told 'em Toyota only charged $15 for a new one. In truth I had no idea what Toyota charged for them and still don't, but the little bit of haggling got the price down to $10. It came with a bonus air bypass valve to boot (see picture below).
After loosely installing to see if it would work, I was pleased to see my idle increase after turning on the AC. So I set out to put the proper bracketry on it from the old unit.
Below you can see how the VSV disassembles. The bracketry is used to hold it together. Little tongs are spread out which hold it together. I squeezed them together to remove, then pulled the rest of the assembly apart just to take a peak. From left to right on the disassembled VSV: the black plastic piece makes up the manifold and contains the coil. Next the piece that slides inside is the part that actually blocks flow between the ports. A spring keeps it in the blocked position (until electricity is applied through the coil). Finally a vent piece is installed and sandwhiched between the bracketry.
After moving the 22RE bracket over the 3.0 VSV, I had to be creative respreading the tongs that held it together. I found a no1 philips screwdriver bit worked great. I put it between the tongs and hammered, spreading them apart and completing the swap.
Now that the idle up VSV works, I can put the AC on without fear of stalling! What a great fix that took less time than typing this post.
Finally, I have two questions:
-What idle up RPM is good for when the AC is running?
-Is the idle up VSV activated for anything other than the AC?