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Fuel filters and oil and oil filter would be my 1st choice. Make sure to use OEM Motorcraft or racor filters. Do not use AM except for Fram CH9549. It is also made by Racor. Once you have this problem ironed out I would service the rest of the truck so that you have a basis to work from. The 6.0 can be a good engine but it is very finicky when it comes to proper maintenance.
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