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Message: <blockquote data-quote="95-stang" data-source="post: 818307" data-attributes="member: 9031">"basically, the surging you get, or the hanging idle... is from the car being at a high rpm, the ECM says "the IAC is open to this much, and the throttle is closed.... so then why am I at this high an RPM?" and closes the IAC valve to bring the car down to the PROGRAMMED idle RPM. so now your idle drops off, typically falls below the programmed RPM and the ECM goes "holy SH*T, im going to stall!" flips the IAC open again, and your RPM shoots back up. "Well that does make some sense. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite2" alt=";)" title="Wink    ;)" loading="lazy" data-shortname=";)" />While i'm on the subject where should the air screw on the throttle body be set?I've read about 2 turns out, 1+ half etc etc.</blockquote>