340 popping through carb at low RPM.

Please see the question in post 6. Describe the pop please. Does it go pop pop pop pop or is it pop here pop there run good a minute and pop here and there again?
It definitely not a pop pop pop. More like one or two pops on acceleration and then clears up once it's off that 1000-1200 rpm range. It will also do it randomly on the highway if the motor slows down going up a hill in 4th gear. If I speed up to keep the rpm up, it's fine