It needs a new set of plugs. The plugs are partially fouled either by oil, running too rich, weak spark, or the wrong heat range.
Be sure to go with the correct heat range when you replace them. If there are signs of blue smoke, that is a sign of oil burning. Might want to step up one heat range higher on the plugs, especially if the tractor sees light duty.
How does the temperature run? Is the thermostat bringing the engine up to temperature? A cold engine is more prone to fouling plugs.
Double check the ignition system, point gap, and all ignition components.
When you get the new plugs in, watch for any signs of black smoke. Check the air filter element (not just the oil cup), main jet setting, watch for signs of carb flooding, dripping gas, be sure the choke fully opens.
What is happening, when you pull the plug wires back from the plugs, the coil has to build more voltage in order to jump the higher resistance gap. That gives just enough extra voltage to fire the partially fouled plugs.
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