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I have a 07 f250 6.0 I'm having power issues with if I start it up when it's cold and let the truck warm up for 15-30 min will barley shift and get up to 40 it does billed boost and feels like it has a miss in it I have changed the fuel filters and drained water separator and fresh oil with 15w40 rotella any ideas what it can be ?
 

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Have you checked your FICM voltage or it could be stiction in your injectors. I had stiction and I changed to Rotella T6 5w40 and it helped alot with cold starts.
 

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Agreed^^ check ficm voltage, do you have a monitor? Any codes? Egr valve? If so clean egr valve, check codes, and ficm voltage.


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