Paul........Question.
Is the backfire/stumble more when you try to accelerate hard from stop.... Reason I ask this is. If you carb accelerator pump is givng too small a shot (and if its a holly design could even be the pump cam is wrong), you could just be running way to lean. (ie. not nearly enought fuel with all that quick air).
I'd also add this. I've see folks setup the initial setting to the pump wrong, where basically its not even giving a "squirt".
Bob
Bob
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