by the way, it's not the best way to calculate AFR, but if the O2 sensor is in the .9xx's, that's a little bit rich, so leaning it out will help you get a little bit more out of the injectors, although if you can't get the pulsewidths below 20, you really need bigger injectors. You need to use a wideband to measure it and see how much to lean it out.
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