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What engine is in your truck?
Ok. Usually this is a fault with the fuel pressure control valve.
where would this be located at ?
i will get you a diagram.. one minute please
Sorry about the delay. I had to restart my software. What you are looking for is item 2 in the diagram.
FUEL PRESSURE CONTROL VALVE
here is more information on it's repair
here is the diagnostic flow chart to help you determine with certainty what the cause is as there are other possibilities as well.