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Hysteric, that is an excellent post. Thank you for the link. I am looking at the chart now and I agree that my 440 is far happier with an idle between 11.7-12.6. I get far better vacuum readings with that A/F

My problem is when RPMs increase off-idle, the mixture drops in A/F to 10-11 and I get a stumble in power. After the quick stumble it starts to lean out as it should. I only get this from idle. If I lean the idle mixture to 13-14 then the drop and stumble is not as bad.

On the other end, the power is 1-2 points too lean even with the jet and rod changes and my WOT is still too lean as well. I am hoping some spring changes today may help with those too.

As for the low-end rich stumble, I may replace the nozzle on the accelerator to get a leaner injection to help me get that smooth transition from idle to cruise that is shown in the chart you posted.

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