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The Idle Air Control (motor) valve and Auxillary air valve are two different things. The IAC valve is part of a constant idle control circuit which your car, an '81 doesn't have. The IAC valve is a motorized cylindrical valve is unlike the Auxillary Air Valve which is on your car is a bi-metallic strip which activates a damper valve to give fast idle when cold, for only the first 10-15 seconds after the car is started, given a signal by the thermal time switch. The AAV is located on top of the valve cover usually bolted down to one of the nuts on the cover towards the center. When the temp outside is about 60 degF, the valve opening should be ~1/8 inch. If it's opened a lot more than that, (broken) and not closed when running a hot engine, OR is shut when it should be opened, an improper adjustmant of the idle screw may have beem made, which could cause poor idling conditions. Note that when the engine shakes upon startup the vibrations are intended to help this valve close properly, so it should be bolted down well. If you remove it an knock it around and it doesn't move, it is probably bad.
Now that we know you have K-Jet w/o the constant idle circuit it opens up into many other possibilities. Vacuum leaks are a big problem on K-jet as is the fuel delivery. Start to look at these things and then see.
The portion of the throttle body where the idle adjustment knob is located can get gummed up and should be cleaned periodically. Also check to see that the solenoid for the fast idle for the A/C isn't sticking, also in the block with the idle adjustment screw.
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'89 245 sportwagon, destroyed by hit & run driver, RIP. '04 V70 2.5 T Sportwagon, 12k mi and '91 245 5-speed, 209k mi, replaced the '89
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