A very common proplem with this engine is the coil packs sit on top of the spark plugs with a approx 4 inch boot to the spark plug. Especially when there is wet weather moisture will get the the spark plug hole and when the vehicle gets up to temp the moisture will atomize and ground out the spark plug. Sometimes it will not even need to get hot and once it starts missing won't go away.
You will need to run a scan to determine which hole is misfiring. Then disconnect that coil and remove the one small bolt retaining itand pull it up out of the hole. Then take compressed air and blow out the bottom of the hole to dry it out. Re-install coil and your problem should have gone away. If you have a scanner sometimes just clearing the codes and the miss will go away. Be careful taking it to a shop as most shops will just sell you with the fact that you have a bad coil and have it fixed in the process of selling you and installing a new coil of hey maybe they will just blow it out and seeing as it's fixed you now buy into the fact that they replaced a "bad coil". That is not to say that sometimes it is just a bad coil and nothing else will fix it.
v8 triton is the same motor as the v10 with just 2 more cylinders so v10 or 5.4 same thing will apply.
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also the plug in connector may have a not so tight connection to the coil or the injector. As last resort, take a pick and bend in the connectors contact points for tighter fit. this will tighten a loose connection.
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My solution for misfiring on V10: I read all the solutions here, but my engine had been completely rebuilt 15k ago, including all coil packs. Shortly after, it blew out a plug (probably due to over-tightening by the shop) and was parked for about a year.
We checked the codes, but nothing there. Checked the sparkplug boots, nothing obvious. Misfire started only when engine warmed up, was fine cold. Eventually, a coil pack failed completely, set a code, and we were able to isolate it. When it was removed, examination showed that the bottom-most 1/4 inch of the boot had a split in it. It was so close to the engine that you could not see it without removing it. We suspect that the arcing from this to ground as the engine warmed up and the split widened is what caused the coilpack to fail.
Lesson: Be sure to take the boots off COMPLETELY and examine them CLOSELY for cracks and splits. Below is a picture of the split we found:
Check spark plugs
Check the sencer on top of the rear end it has two wires going to it
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extremely loud knocking sound
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