Hey!

It's called "Throttle Close Position Switch".

It tells the ECU that the Throttle Plate is close and allows the ISC cct to be operationnal. That is why we get funky idle when it is out of adjustement (Does not tell the ECU that the Plate is closed). All you need to adjust it is a wrenck (12mm, I think) and an Ohm Meter.

Hope this helps.

Ghislain.