New spark plug not firing

Hi again, yes the check engine light has been on for quite some time. The truck is a 2011 Ford ecoboost there is no fire on the first plug of the three plugs on the drivers side. I believe it’s the number one plug. I changed all 6 plugs and still had the problem so after running the truck and testing anything I could think of I pulled the plugs again and that’s when I noticed that the one plug was still shiny, wet and new looking and with the way it was running it wasn’t hard to determine that for sure that plug wasn’t firing.I had just changed the boots, and I checked the coil and it seem to be fine. Also I ran the truck without the coil on that particular plug. I ran the truck with only 5 plugs connect and it ran exactly The same as it did with the sixth plug connected. I don't know?

We switched all the coils and checked everything will even change the wires going from the spark plug coil up to them main output I think it’s the ECM and it still doing the same thing I don’t know if it could be a module or something inside the actual computer causing it to not fire on one cylinder? And every once in a while you can feel and hear that cylinder kick in? I don’t know what to think.

Yes, we tested the wires at each one of the coils and there seems to be 12v of power in all 6 of the wires leading into the coils. It sounds like the plug fires right when it’s started and every once in a while it sounds like it fires but not much.

Hello again, thank you very much. I’m going to have a look at the PCM right now but that sounds right to me. I’m wondering if because I had someone not qualified to do the work if maybe the vacuum lines have been hooked up wrong as well. I know for some reason they don’t look right, but I’m not 100% sure. Anyways if there was a vacuum problem could that possibly be a reason that I’m getting a misfire or no fire I should say? I thought maybe if the sensors are getting the wrong signals that may throw something off? Also there is what I believe is a brake assist vacuum that sits right behind the drivers side headlight roughly or just under it, That I had to take apart and rebuild because of my very isolated community and limited funds ordering new parts is only a if totally needed option. Could that possibly lead to my problem as well?