yes the microswitch is working properly.

I narrowed my problem down to either the IACV or the OVP relay. I swapped both units from my working M103 W124 and my problems magically went away. I am putting the original OVP back in place to see if problem reoccurs.

edit:

original OVP, car still runs fine. it is the IACV. the 300E is now idling funny.