P301 Cylinder 1 misfire question 2003 5.4 Expedition
2003 expedition with the 5.4 115k miles on her. Always ran perfect. Just developed a cyl 1 misfire. This is the front cylinder on the passenger side - right?
I changed the coil pack - seemed to fix it but after the car cooled off a bit same misfire on cyl 1. Car warms up a little and it smooths right out. Cleared code and later that night after cooling off a bit the roughness came back and smoothed out again after a few mins. I'm thinking it's time for new plugs because of the miles.
Thanks in advance for any ideas you can throw my way