Ok, put it in the shop. They were unable to find any external vac leaks. They could not rule out internal vac leaks (WTF are internal vac leaks??)

The shop found the info about the power steering pressure sensor possibly causing this, so they started to check that out, but in the process found a broken wire from an oil pressure sensor (tho the invoice indicated it was an oil pressure SWITCH) and once that wire was corrected the idel went down nearly to normal.

They were as suprised as I was.

So I got the VX back from the shop, and to me the idle is still a bit high. But at least not 2000-2600 RPM.

I had never heard of this potential cause before so I post it here. I think it will take more testing before I'm convinced because the high idle condition was intermittant anyways. I post the info from the shop here simply because it was news to me.