This is exactly the way I interpret tech manuals describing how the throttle plate stop screw is to be set. On the wife's EFI 302, I unplug the IAC and turn the stop screw until the engine idles 200 rpm less than normal, then plug the IAC back in. Works perfectly.
In the 10 years we've owned Fords, we've never had an idle problem. We do however, clean the throttle body, EGR valve, MAF and IAC on a yearly basis with solvent, to keep it that way.
-JD
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