Bad Accelerator Pump?

[Shaffer4]

My K20 ('67 on a '72 frame) has a little carb issue. It has an Edelbrock Q-Jet carb. While driving around it drives fine some of the time (though it is always testy when leaving from a stop.), but every few minutes it will start stalling and missing and spitting and Popping and if I let off the gas it dies, to keeping running during this phase requires copious amounts of throttle. After a few minutes of this tango it will even out for a few minutes and then repeat. Make driving in traffic a nightmare I can tell you... and with all the snow on the ground it is ten fold.

I originally thought it may have been the choke, as the previous owner had not hooked up the electric Choke, I fixed that and it made little difference.


Edit: 350ci/G-4speed/np205