My truck is a F-250 extended CAB with the 5

The idling fuel pressure is 28-45 pounds, something I may suggest, the 5.4 triton was common for vacumn leaks, hoses, intake runners, brake vac. Booster and such. This will also cause a slight miss at idle, also check egr valve for leaking. Spark plugs on high mileage engine can also cause problems like this. If determined to be plugs, be very careful as they are know to break of in cyl. Head and will require specials tools to get them out. Thanks