Idle Speed and Air Temp/Humidity Options

[StarBear]

As getting ready for the 2022 Northeast Gathering, I'm encountering a semi-recurring idle issue on my 1974 1.8L LJet FI. When outside air is cool and dry, idles just fine at 950-1000 rpm. When outside air is warm and humid, after warmup the idle falls off to barely running. I've just been adjusting the air flow screw (maybe 1.5-2 full turns) to open it. Of course, the reverse happens - if I preadjust the screw it idles near 1800 then settles down to 1100 after the engine gets totally warm (15 mins or so).
I presume (?) there SHOULD be some regulation, perhaps with the ECU or AFM, to monitor air temp and humidity and make adjustments automatically? I didn't have to manually do this adjustment in the past.
The AAR works and tests out fine. Just annoying to have to pull over after running a while and adjust the screw. (IMG:style_emoticons/default/dry.gif)
Your thoughts @Van @Van_B and @Wonkipop ?

[wonkipop]

only thing i can think of is the other temp sensor.
temp sensor 2 i think it is called in factory manuals.
this is inbuilt into the AFM unit.
i don't think you can do anything about that one if it starts to play up.

that sensor measures incoming air temp.

its possible with high humidity perhaps the electrical connections are affected by moisture? i seem to remember that living in chicago it got monstrously humid unlike anything i experience in australia. perhaps try cleaning the electrical plug connection to the AFM with electrical cleaning fluid. also the plug to the ECU. nothing to lose. check all the engine grounds for being clean and corrosion free. thinking you had it standing stored for your horrible winter and you have only set the car free recently?

@Van B might have better ideas.