u/MeHoyMinoy_69

I'm going to preface this by saying I know valve springs and rocker arms and exhaust valves are possible issues.

Few weeks ago I started having a P0307 code for Cyl 7 misfire. It would flash the CEL occasionally and run rough. Replaced top plug, things went back to normal for a week or two. Code and misfire came back. Replaced coil pack, it got better but didn't go away. Had to drive it for a week. Replaced the bottom plug and wire, ZERO change. The bottom plug had broken off on the tip into the wire, but came out of the block fine. Drove it another week like this. Today I replaced the injector for that cylinder and it's the biggest improvement yet, it runs great. Until I accelerate a little hard or put it under load going up a hill. Then the CEL flashes and it runs like shit for a while, it evens back out when it's not under load though. No weird noises, no leaks other than maybe an exhaust leak because the truck is a little loud with the exhaust.

Anything I can look for or test or check would be appreciated, I need the truck back in service Monday for my trailer...

2014 F250 6.2 XLT, w/ 4wd and 170k miles

Bought the truck a few months ago, ran great. Has had 2 codes for the O2 sensors but I haven't owned a vehicle that didn't have those codes. Few weeks ago, it started running rough and missing on Cyl 7. Replaced top plug, it got better for a week or two. Then it got bad again. I replaced coil pack. It got better, but didn't go away. Replaced bottom plug and plug wire for Cyl 7. No change whatsoever. Replaced injector today, and it made a BIG difference but still stumbles on Cyl 7 when I accelerate, but it's nowhere near as bad as before.

Is it possible the coil pack I bought has gone bad? It took about a week between changing the pack, bottom plug, and wire to today where I replaced the injector. I have to pull a trailer Monday and need this fixed tomorrow, any help is appreciated.

I've had a misfire on Cyl 7 off an on, I replaced top spark plug and it went away for a couple of weeks. It came back, I replaced wire, coil pack, and today the injector for that cyl. It's still misfiring but not as often? Like it runs great but will randomly start to miss on Cyl 7 under load then it goes away. Check engine light flashes for a few seconds, then it evens out. Before I replaced the injector it was constantly misfiring.

2014, 6.2 XLT 4WD w/ 170k miles

Any help is appreciated, I'm losing my mind and have to pull a trailer Monday.