Found the Idle Control Valve, removed it, cleaned it and put it back in.

Car started right up but idle returned to 1200 rpms.

Pressed microswitch and idle dropped immediately to 800 and stayed there.

I noticed that the linkage does not touch the microswitch at any time in order to activate it.

Question...is the microswitch activated electrically or mechanically?

After engine shut down I started it up again and again it went right to 1200rpm and only after I predded on the microswitch did it return to 800rpms and stayed there.