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I use the LM-2 and really like that it records to an SD card. Unless you have a stock cam, don't use the A/F reading to set idle. Just set it where it idles best. If you want to be cleaner just lean it out from there as much as you're willing to tolerate.

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That's exactly 100% correct........ I don't even look at the O2 when setting idle mixuture......it can be really high or really low when it's idling best with very much camshaft......