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The IAC motor controls idle speed only by bypassing air around he closed throttle plate. If you are setting a mixture code, you have another issue. You can push the pintle in to retract- but dont screw it. If the engine will start and run while holding the throttle, the computer may have lost control of the motor or the motor is bad. If you have access to a scan tool that can set idle speed, set speed to 1500RPM and see how long it takes to respond and close when deactivated
 
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