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  1. J

    P pump problem?

    For my 95 Ram 2500 Cummins, 250k miles- Problem only occurs on long drives on highway in hot weather. After a few hours, loses power and feels like it is misfiring. Have to pull over. I pop the hood and let it cool 1/2 hour, it's fine, until I drive it another hour, heats up again, same...
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