@diymirage do you recall the brand of replacement coils that you used on this 100,000 mile tune up? (and spark plugs?)
There are lots of scary Chinese replacements on Ebay. Nice to know brand of the ones people have had good luck with.
I located a good guy on youtube who was well versed In the Ford Triton 5.4 and 4.6 v8s. He uses only the Denzo coils and Motocraft plugs for the Fords.
So I went with those off of his recommendations on my 5.4. Solved all of my misfire problems and still running great today, even after running a 1700 mile cross country trip.
Still perrring like a kitten.
☆☆☆☆☆