I have a 2003, F250 SD, 5.0 with a weird problem no one can figure out.


Now it doesn't matter what time of the year it is but after the truck sits a few days when I go to start it up it run roughs. Sometimes for a few seconds sometimes a few minutes then it "straightens" itself out. Recently it took almost a day to fix itself.
No engine codes, no other symptoms.


Any ideas?


Thanks