>
> I was going to perform the 2nd check “regulator”, however I am unsure
> about the step where one connects the multimeter with adapter to idle
> stabilizer valve #1 in the photo. Problem is the photo shows the O2 sensor
> and not the valve.
>

Put your meter in series with the valve.  The connector is a three-pin
version of the Bosch-type fuel injector connector.

Yrs,
d