AVS 650 hesitation

One problem I have seen on these edelbrocks is the check ball for the accelerator pump will stick and you get no pump shot. If your not getting any spray from the accelerator pump, check this first.
Have you tried changing the springs for the plungers circled in the pic? Sorry, cant remember what they call these. Anyways, these are held down by vacuum and when you stab the throttle they lift from the absence of vacuum which then opens the jets. Too heavy of a spring will hold them down too long and you get a lean bog.

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