Carb tuning, accelerator pumps.

Mike 340 said

that gap should be set at wide open throttle.
No gap should be there at idle.
Not sure on a proform, but the holley''s are about. 015 .

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Agree.
The other thing to check is that the arm is touching at idle - no slop. some pump cams require a slight rework of the arm (assuming yours has a metal arm).

PS If there is delayed response when opening the throttle very slowly, then its the idle circuit needs adjusting.