Hi guys am kinda new here. I have a 2005 F150 with a 5.4 Triton motor in it. I have developed a missfire in cylinder number four. I have replaced the coil and lpug but still has a miss in the same spot. got any ideas please

 

What brand of spark plug did you use, I've found motorcraft ones do work better, ngk and denso are also good, bosch is not so good.
You can get a noid light and see if the injector is receiving voltage.
Do you have fault codes?