part throttle bog/hessitation/backfire

holley call for .015 clearance between the pump lever and the linkage at wide open throttle so that the pump does not bottom out...

But...at idle..there should be no clearance between the pump lever and the linkage...if the linkage moves the pump should squirt.


[ame="http://www.youtube.com/watch?v=k-Nx5HEzvlY"]How To Adjust The Accelerator Pump On Holley Carburetors - YouTube[/ame]