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I just want to point out that you don't really want to label 14.6 as the "ideal" idle AFR. While OEM often aims for that for emissions reasons, if anyone has tuned their car they will most likely not get that value.
Tuning idle fueling is really in the interests of achieving the highest vacuum possible. Done this way my car idles best at a 13.7 AFR with ~22 in of vac.
Some really crazy cammed stuff has to go as low a 12.5 sometimes.
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