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tractor engine surging at low rpm

  1. Ford / New Holland
    841 Ford-gasoline. Fine when cold, but when warms up, the engine speeding up and down at low rpm. Smooths out at high rpm, fine under load, or fine if pull choke out right spot. Fuel bowl/screen is clean. At lower rpm lopes, sounds like a Harley. I adjusted governor to keep it from shutting off...
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