Thanks for the input guys. New plugs, Wires will be checked ASAP. No check engine codes and it is open exhaust. No cats or mufflers. There is a fuel pump rewire mod which we are looking into. It changes out the power wire going to the fuel pump because the stock one only sends 8-9 volts, not the 12 necessary. Just wondering what you guys thought it could be related to. Sounds like fuel Maybe.
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2001 Dodge Cummins 
Tuning is addicting. Lol. 
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