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When mowing it will idle up and down because of the amount and thickness of grass you are cutting. This is because the blades will struggle cutting thick grass so the engine needs more revs to keep the blades running at a constant speed and that is also why your mower may slow down because it has used the majority of revs to cut the grass and their are not many revs left to keep the wheels spinning

The up and down revving could also be caused by a dirty/clogged air filter.

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Q: What cause your riding mower to idle up and down when am mowering?
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