2014 Ecoboost F-150 Misfires

Where my F-150 peeps at?

I was driving my dad's F-150 with the Audi on a trailer last night and I got a flashing CEL. Oh boy, misfires. No loss of power or stutter was detected by the old butt dyno, so I stayed in it. I was at WOT at 4,000 ripp'ems when it happened and I wanted to see of it would become noticeable. Nope. The rest of the drive was uneventful. 

At 76,000 miles, my guess is that the original spark buddies are fried chicken. ChatGPT agrees, but it also suggested I look at cleaning the intake valves because this is a direct injection engine. (It suggested a spray, as preventative maintenance, and, I quote, "an Italian Tune-Up") It's convinced the old sparkelators are not sparkelating though.

What sayeth the hive? Are there any hidden gems that the 3.5 has for us?

Plugs. Those 3.5's are hard on them. If they havent been done yet they are well overdue. May want to do the rubber boots on the coils while you are in there.

OK, I'm glad to hear that. I'll get the boots for it, too. We'll dig into it this weekend and give it a tune-up. Thanks!

My 2015 Expedition has the exact same engine as the 2014 3.5 F150's do the plugs every 50k-60k miles and oil change every 5k miles. Mine is currently over 160k miles.