2003 F150 4.2L misfire
#1
#3
#4
I have a 97 4.2 that is doing the same thing but without any codes. You can pull the spark plugs and starting with #4 they steadily get worse up to #6. I need to get out and pull the fuel rail and check the injectors and harness but have too much going on right now. Let us know if you find anything on yours!