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Q: My 2003 ford f 350 with 49000 miles on all of a sudden is running like sh_ _. on 2003 Ford F-350 Super Duty

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Stering wheel vibrating due to engine running lousy at idle. It goes when i step on it. When i let off lousy again. joe
(1) Answer
pull fuel filter and see if any water in fuel. if fuel fine than explore ignition system. have a diagnostic run.