Manifold Vacuum Experiment

Bewy said

Rusty,
I assume this is a Holley DP carb? I doubt it is the acc pump. Put a piece of thin wire in the Idle Air Bleed to reduce the size...& test drive.

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I've Leaned it out on the idle circuit with leaner idle air bleeds. 4 steps first, then 4 more. Made it worse each time. Trust me, it's the pump. I can SEE the difference front to back. It's huge. I think I'm going to check the angularity of the pump arm and then I may swap pump cams. Something simple and costs nothing.