Coil On Plug Again?!?!?

[b2smith]

I've got a 2002 Expedition with the 4.6 liter. Approx 94k miles

Around 60k miles I had the infamous "sputtering" when accelerating and after much research and $$ it was determined from Ford that it was a Coil On Plug.

Now the sputtering is back and getting worse. What are my options? Should I even think about trying this repair myself? (I've replaced plugs and wires before)....

What's the best way to diagnose? Should I just bite the bullet and replace all of them with hi performance aftermarket?

Is the coil separate from the wires? I heard often it's just the wires??

Thanks for letting me ask all these questions

 

[b2smith]

Additional info

One additional piece to add is that there are currently no codes detected by Autozone and the Check Engine light is not displayed...