Zipdrive 20

I have read the manuals and it's not clear to me how to set the primary throttle stop position.

The fast idle position is clear, 16 to 20 thousandths at 77 degrees F. Did that this weekend with the throttle body off. Set the thermo wax also. The manual also shows the proper gap for determining the 15 degree relationship between primary and secondary open.

What is not clear to me is what the primary throttle gap should be when off the fast idle cam. There is no reference in the manual that I can see. How do you correctly set the primary throttle stop screw?

I made all the adjustments on the attached page. It does not cover the stop screw.

Zipdrive 20

Found some references to setting this stop. Instructions said to move 1/8th of a turn until you have linear adjustment on air adjust screw. Another reference said to use the stop as an idle adjustment which actually worked well.

After some adjusting and driving finally decided on this method.

Open air adjust screw one full turn from fully closed.
Set idle on warmed engine using the primary throttle stop to 800 RPM.
Shut engine off and re-set TPS, it will have changed.

Now I can adjust the air adjust screw one full turn down and up as needed. I finally chose 1000 RPM based on smooth idle with A/C on. I also found references to 1000 RPM as a good spot for older engines.

Still going to dig into why the A/C is rough with lower idle, suggestions appreciated.

Why am I doing all this? I am not the original owner and simply base lining all settings. I have found a ton of things set wrong and I am really having fun learning. Car is beginning to run pretty well and repeatably also.