It's a magneto, and he replaced it with a known good magneto.
If the choke changes how the the tractor runs when it's dying, it's a fuel problem. My money is on either a fuel flow problem, due to a clogged sediment bowl or line, or a float/needle issue.
I know people get frustrated and just buy new carburetors, and voila, the problem is magically fixed, but they're wasting money. A lot of money.
Short of the carburetor being smashed to pieces, there is very little that cannot be fixed on a carburetor to restore it to like-new condition and operation.
The float and needle are the hardest things to get right, because you're working blind. There's very little clearance between the float and float bowl, so if you're slightly off, the float rubs the bowl and doesn't work right. Sometimes it takes several tries.
Very few people really know how to correctly rebuild a carb, I've found out. Just because you 'had it rebuilt' doesn't mean the rebuilder knew what he was doing, or didn't make a mistake, or didn't just take your money and play you for a fool...
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