I've had the same probelm for quite a while now, but I have an earlier model (84 944), where the aux air valve (AAV) only has 2 wires going to it with battery voltage. I guess the opening and closing is done by the temperature affecting the AAV itself in the engine block.
My car starts fine (running rich, 1000rpm), then once it warms up after like 30 seconds, the RPM drops to low levels (700), until the car warms up a bit more (temp indicator in middle of black zone)then it rises to the normal 900-1000rpm ... I checked the voltages and resistance, but they were fine. Taking the thing out to clean it is a ***** ... and the easier, bur more time consuming, way to do it is to take out the intake manifold!!! Yeah like I have time to do that!!!!
Good luck, and if it is no major problem, I would just deal with it by kicking the accelerator until the car warms up ....
I wish I had a manual (choke) that never breaks down like that ... oh well.
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Lock Stock '84 944 and two smokin' tires ...
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