Re: 305 TPI cold start switch
There is no adjustment to the IAC. The ECM controls the rotation of the IAC motor to move its pintle in/out of the seat to control the engine idle rpm. The whole concept is a controlled vacuum leak to adjust idle rpm.
Sometimes, the hole/seat gets carboned up and needs cleaning. What Dave is suggesting is to clean the passage, with the IAC out, gently push the pintle back into the casing, install the IAC, disconnect the battery for about 20-30 seconds, reconnect, then turn on to IGN only for 15 seconds, then off. This power up sets the IAC via ECM for initial run. Then start the engine and drive the car up to say 55 MPH for the ECM to relearn.
Changing plugs & wires will definately help. A new air filter will also.
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