Just got a 5.4L Expedition earlier today ( 60K miles )- noticed it has a bit of a miss at idle and noticeable miss above idle. The check engine light flashed quickly and then stayed lit. Any ideas or common things to check for & how do you retrieve the error codes?

I don't know if it had the miss before I washed the engine compartment - although I did have the truck running when I was cleaning. Everything is dry in there now.

Thx

Vlad
98 Expedition
99.5 Super Duty Diesel