help identify the mystery wire

Progress is slow putting my 04 Taco with a 2.4 back together. I keep finding things I want to replace, or things I didn't order I knew had to be replaced. On line orders take days.
I've got most everything figured out. Most of the wiring plugs. But here's one I can't can't figure out where it goes. Its got to be up under, or close to the air intake chamber. You can see there is what looks like a ground that goes with it. Most all of the others are mated up this point, the exception being the 2 on the intake air device. It's not yet installed.
Lots of odds and ends to tend to. I ordered a shifter lever bushing, just because I thought it was a good time, so I can't put that part back together until it arrives. That and a outer tie rod end. I put coolant and new oil in it this morning. It won't be long now!

 

Never mind. I think I found the sensor that this plugs into. Below the other intake chamber piece. I may need to remove it to get to this plug.