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Bucking in all gears. 120-130

Could someone please explain the most likely causes of a 122 with a B18 bucking? It bucks in every gear and is most noticeable in low gears and is nearly constant when decelerating, although it will happen when accelerating as well.
My hunch is that the phenomena is related to the fuel float chambers and/or check valves. Are there other common causes? Should I reset the floats? How would I know if a float is bad?
Thanks in advance.






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