Aux Air Valve
Another thing you guys are overlooking is the Aux Air Valve, which is supposed to shut off the extra air once the engine has warmed up. I had the problem of idle creeping up once the engine warms up, and that was frustrating, since it was the Opposite of what's supposed to happen.
I took the Aux AV out, cleaned it, tested it to make sure it closes and opens normally, readjusted the opening when cold (which is done with a little nut that holds the plate in place) ... and now, the engine idles at 1100 when cold, then slowly goes down to 950.
If your AAV is not working, then you might be running rich and lowering your idle to 950 at the beginning, then when the O2 sensor kicks in, it corrects for that and the idle rises to its warm level of 1100 ... which you could adjust with the throttle body screw once you've fixed your AAV.
Good luck.
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1984 944
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