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Engine on riding lawn mower surging

The engine on my MTD riding lawn mower surges when running. The surging began after 90 minutes of steady mowing after filling the gas tank. The surging goes away under load or moderate choking. The engine is a Briggs & Stratton 20hp V twin abour 8-10 years old that has been running well up to now. What should I look for?

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Dirty air cleaner.

Clogged fuel filter.

Replace or clean both...

Posted on May 29, 2009

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