Most likely the injection pump, either the drive or timing module connections or the mechanical governor sweep.
SOURCE: D3500 dually diesel has rough running problems for
I would look more at your injector pump than the lift pump....Dodge does have a problem with there fuel delivery ( not enough consistent PSI ) which in turn takes out the injector pump mainly because the pump has be running to lean...So look at replacing your delivery pump with something 14PSI or greater, unfortunately sounds as though you will have to get your injector pump either replaced or rebuilt
SOURCE: engine begins to miss when rpm's approach 1800
check fuel pressure first.it needs to be hooked to scanner to read fault codes to narrow it down.may go ahead and change fuel filter there pretty cheep and it sure won't to have a new one.hope i helped...
SOURCE: RPM Oscillating
have you had the vehicle speed control reprogrammed if not that could be your problem
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