Timely thread. We had some mis-firing on our trip two weeks ago to the Outer Banks. With 106,000 on the odometer I knew we were pushing it with the spark plug change.
When we got home Google found some threads on Ford forums and U-Tube videos about doing this job. Most were for trucks rather than motorhomes, but the suggestions were good. So far I have removed the driver and passenger seats to get easier access and I'm hoping I can do the entire job myself. True that there isn't much room to work and a lot in the way. I removed the right rear coil and spark plug, which was the easiest to get to. I wanted to be sure to get the right replacements from the Ford parts guy. All new coils as well as plugs as my goal is that this will be a once in a lifetime job.
I plan to take some pictures and write up my experiences in getting this done.
BTW, I counted 8 threads on the spark plug. Once I broke it loose, it unscrewed easily. Hopefully a sign of good things to come.