So I've been having an issue, a while back I was having a problem where at anything over about half throttle I would lose power and the truck would start bucking like it was running out of fuel. I replaced the PRV and it went away. Now on long trips 2-3 hours of high way driving it will start doing it again, runs fine until you try to accurate and it starts bucking again. Today I pulled a 34 foot horse trailer to Kentucky bout 4 hour trip and it did it even worse. What's the issue, I don't have gauges but I'm thinking it's the lift pump


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