Most likely however it's a lean carb idle mix. Try running the engine and when it begins to surge VERY slowly pull out the choke. If you find a choke setting where the surging stops it's either the idle mix adjustment or a vacuum leak.
Now with the engine warmed up and idling slowly turn the idle mixture screw in or out 1/4 turn at a time until the surging stops (you may need to reset the idle stop screw afterward to slow the idle back down).
If you can't cure the surging with the there's probably a bit of junk (rust, etc) plugging the idle jet. Time to go inside the carb for a cleaning.
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Today's Featured Article - Identifying Tractor Noises - by Curtis Von Fange. Listening To Your Tractor : Part 3 - In this series we are continuing to learn the fine art of listening to our tractor in hopes of keeping it running longer. One particularly important facet is to hear and identify the particular noises that our
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