that's the ghetto/old-school way to adjust idle. the idea of the IACV is to keep the throttle plate completely closed, and use the solenoid controlled valve to allow air to bypass the throttle plate. if your IACV is not adjusting properly for idle, you need to fix it...not back out the screw on the throttle body. I made that mistake a while back. I learned my lesson.
Eric
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2002 Mazda Protege5
1989 S13 w/SR20DET (sold)
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