Recently bought an 03 supercrew with the 5.4.
It had a misfire issue in cylinder 3. Removed the coil and saw the boot was on backwards. Put it on the correct way and put the coil back in. Fixed the misfire for about a month. Misfiring again, read that the electrical plugs sometimes break so i went to check. Found that cylinder 1 and 3 coils were loose. Question 1, would that cause a misfire? I went to tighten and neither of screws would get tight, but they both will unscrew out and screw in but wont tighten. Question 2, how do i fix this? Or if someone could post a link to where i can find out, i tried searching