Triple check that the accelerator pump is actually working on that carburetor. Those 4010/4020 gas tractors liked to backfire hard when shut down hot, that would rupture the diaphragm on the accelerator pump in the big M-S carburetors. Momentary stumbling on acceleration is a symptom of an accelerator pump not working. Opening up the load jet just masks the problem and wastes fuel, as you've already found out.
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Today's Featured Article - 12-Volt Conversions for 4-Cylinder Ford 2000 & 4000 Tractors - by Tommy Duvall. After two summers of having to park my old 1964 model 4000 gas 4 cyl. on a hill just in case the 6 volt system, for whatever reason, would not crank her, I decided to try the 12 volt conversion. After some research of convert or not, I decided to go ahead, the main reason being that this tractor was a working tractor, not a show tractor (yet). I did keep everything I replaced for the day I do want to restore her to showroom condition.
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