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Good Day David.
I'm glad you located your problem.
Regarding the stumble at 2000 RPM. From what I understand this is the general point when Holley's transition from the idle circuit to the main. And a common place for the stumble you wrote of. This is usually caused by the secondary circuit not picking up the signal fast enough to compensate to the primary circuit stopping. Most try to adjust around this by over feeding the accelerator pump charge. This helps but is not the true cure. You will need to decrease the amount of air feeding through your secondary cicuit air bleeds. This will pick up the fuel signal faster and create better response with a more precise fuel metered amount. Probably down 4 sizes to start.
It's just a suggestion and I hope this helps.
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