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Intermittent power loss

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I have a 2009 cxu 613. Problem I'm having is getting up to speed on interstate and maintaining it. The last couple gears, the truck just seems flat. Once up to speed if you come up on a hill you feel it stop pulling and boost pressure drops. Sometimes you can ease off the pedal and it picks back up. Any ideas on what to look at?

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I'm not sure. It only does it on interstate. I can run all day off the interstate and it's fine.


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