I have often found that not running smooth when not under load and then clearing up under load can be an airleak. A leaking gasket between the manifold and head or the carb and intake. Could also be in the carburator. When the engine is not under load the the govornor is closing the butterfly in the carb. This puts more vacuum on the manifold making leaks worse. Under load the carb opens up and puts less vacuum on the manifold making air leaking in less. The air leaking in leans out the mixture and causes the chugging.
This may not be it but I have found this to be the cause in the past. A quick easy way to check is to drip some oil where the gaskets are while it is idling. If it cleans up when you put the oil around the gasket, thats it.
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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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