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2012 Kubota 400/idles good backfires when given gas


SPF4524

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Troubleshooting Kubota 400.  it  is tough to start, I have to pump the gas pedal. After it starts it will idle, but bogs down and backfires when I  give it gas. I've replaced the fuel pump and it did not fix the problem. Any other suggestions that would not require replacing throttle body and ECU ?

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