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3rd Gen Ram Tech2002-2008 Rams: This section is for TECHNICAL discussions only, that involve the 2002 through 2008 Rams Rams. For any non-tech discussions, please direct your attention to the "General discussion/NON-tech" sub sections.
I would definitely say that the lifter pump could be the issue... but if I was you, I would try running some diesel fuel tank cleaning additive and see if that helps.