Posted 1/15/2013 22:17 (#2825969 - in reply to #2825786) Subject: Re: 5.9 cummins running rough
Tuscola, IL
Change fuel filter first but i'm betting injector as well. Keep in mind you have also have a VP44 injection pump. If lift pump has gotten weak over time and not kept it properly lubricated, injection pump could be the cause. Always suggest an aftermarket lift pump as well as a fuel pressure guage. I would definitely lean towards injector though as nserfas said.