Stumped and Frustrated with a Holley 670 Hesitation

Bad Sport said

And don't confuse a shot with it's working. Some guys will move it an 1/8th of an inch for example and then see the pump shot and think it's OK.

If you move that throttle and do not instantly, as in right now, see a shot, that could be your issue. It could be as simple as a minor adjustment if you find this to be the case.

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I had the same problim with a 3310 once rack my brain :violent1: for 2 weeks turned out all i had to do was push down the arm that rides on top of the pump cam,it was bent up to much took screw driver and wack it down,it work.Not saying that is your issue but worth a look,i thought the past owner of the carb must of went nuts trying to figure it out lol.