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With the engine slowing down like this, there had to be a code that slowed it. Make sure that the running voltage on the engine is not over 14V DC at 2500 RPM. Use an IR thermometer to take the temp of the engine after it is warm. Make sure that it is below 160* F, higher than this would be an indication of it overheating and the cooing system would need serviced. Also test the float switch in the oil tank. When the magnet on it falls, it should close the circuit. If it is always close, replace the sensor.