I have a Komatsu FG25s-4, which misfires when it is warm. The misfire is slight. However, the forklift shuts off whenever I lower an object with it. It will lift perfectly fine. It used to only shut off when moving an object sideways. Could a bad fuel pressure regulator cause this? The forklift has an IMPCO Model J fuel pressure regulator. Is there a way I can find out if the fuel pressure regulator is bad?
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