Engine misfire how can I fix it?

Complete tune up was done about a month ago and problem still is there and yes this is a 5.4 l with the high thread plugs.

I had to replace the #3 fuel injector fix it, I uses an OEM part fyi.

Engine light came on checked codes found cylinder 6 missfire changed coil and plug run great then light back on cylinder 2 missfire changed coil there still cylinder 2 miss either got a short or im on the wrong coil any help what is the firing order on 2004 ford expedition 5.4l v8 triton

Ok ill do that see what that does what is the firing order on this truck 2004 ford expedition 5.4L v8 triton driver side 1234 passenger 5678 or no

My 2003 Ford Expedition is shaking and feels like the engine is skipping when I accelerate. When I stop there is a very strong sulfur smell.

When it rains, or I wash off the engine the truck runs ROUGH! Last time it did this I had washed off the engline and it ran rougher than ever. It would actually die for a split second and then restart, the lights would dim coming up to a idle, the security light on the dash would keep coming on even with engine running, check engine light was on. I brought it to Auto Zone hoping I could get a clue as to whats shorting out, but when they connected the scanner, the port was dead.
After a night of sitting it started driving right again.
Well now, the weather has been dry, I have not washed the engine off since, but its all of a sudden running rough, missing like crazy during any acceleration. I thought maybe it was bad gas. I put some octane boost, and fuel system cleaner, but to no avail. I bought a fuel filter, but cannot find where it goes. I checked along the whole under side along the frame, see nothing. I JUST replace plugs and boots about 18,000 miles ago. Was running GREAT after that. Dont know if these two issues are the same, or if I have two different issues causing the missing.

Shakes or Wobbles problem
2003 Ford Expedition V8 Automatic 110100 miles

Whenever I hit the gas I feel a slip or skip. I first thought I was the tranny but then I realized it could be the rear diff. Any ideas on what to do

My expedition is misfireing but I cant figure out why. I tried changing spark plugs, fuel filter, air filter, what else could I try?

One sign of trouble ahead was it would have a bad cold start missing and puttin, then once it warmed up it was fine. Now it has a good cold start and when it warms up it starts missing, like that of a vehicle running out of gas. So far two mechanics have not figured out what is wrong with my ford expedition. Had a new manifold put in, because of losing antifreeze and yes it got in the oil, new brain and it still misses while driving. Also had spark plugs replaced and gas filter changed. Both mechanics were highly recommended, so this is going to be a challenge, its been in the second mechanics garage now for going on four months.

Cyl 1 misfire, random misfire, left bank lean. Runs rough through out a trip anywhere. I have changed all the plugs with motorcraft plugs fighting problem for 2 month since plugs were changed