Cylinder 4 Misfire

[Bobmc]

03, 5.4. I changed 5 COPs about 3 yerars ago. (Thats all the store had in stock, and I needed the car to get to work). A month ago, had another misfire, so I replaced the other three. I found dead leaf fragments as well as sand and dirt. This may have been the cause, however, the new coils solved the problem.

It was only because the #5 plug was tight that allowed me to see what was going on. If it had come loose, I 'd of replaced that plug and thought that was the problem, and the same for #3.

For any future mis-fires, I'll try just clearing out the well, checking the COP for corrosion and cleaning/greasing the boot first before replacing any parts.