Mag and carb are 2 different parts of the engine and do not effect each other. If your saying it surges from idle to high throttle then back down you have a clogged main jet on the carb or a bad govanor and weak spring. If you grab the rod that goes to the govanor from the carb and you can hold it steady what happens?? Also what happens if you choke it does that hurt of help?? You can also try this. Pull the main jet cap off since all the ones I have seen on this tractor had a non-adjustable main jet and let gas flow out of the cap for a few minutes. You might also poke small wire into it to make sure it is not clogged up
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