Another thing to look at is the accelerator pump assembly. I once had the rubber plunger un-seat itself from the pump rod and was floating around freely. It sort of worked still, but it obviously wasn't doing it's job right. I pulled it out and re-seated it, but it did it again a couple days later. So I bought the following accelerator pump assembly and that did the trick:
https://www.edelbrock.com/carburetor...mbly-1470.html. The blue plunger at the end of the assembly in the pic is what I'm talking about.