Mercedes, W126 all 8 Cylinder - Airflow Plate resting adjustment, idle speed adjustment & issues

Important Note:
Once the plate resting position is corrected by properly adjusting pin, then
There is no more “gap or play” in the plate and Allen screw should be set to start fuel flow as soon as plate opens up!
This maybe the most important video to watch for anyone working on W126 8 Cylinder
Remember:
Dowel Pin location:
3.8L & 5.0L Engine - driver side below fuel feed line
4.2L & 5.6L Engine - passenger side to the front of airflow potentiometer