Over the last couple years, and 2,000 miles I've been taking the '06 F250 with 59-61,000 miles on it through
what I call a vehicle's 'mid life crisis'. I normally do this at about 100,000 miles, but my driving is mostly in town.
So I figure it has about as many spins on the engine as over 100,000 if it had seen much free-way miles in overdrive.
So I changed plugs and coils. A little while later, it started running rough. A couple of the aftermarket coils had gone bad,
so I changed 'em back to OEM. It was better, but not right.
I try to keep this thing in perfect condition. If I want to go on a long trip-- its ready. Nothing needs fixing first.
And when everybody else breaks down--- they call me. If my car breaks down, I'm on my own.
Anyway- it set some lean codes. In my research through videos and old forums where everybody else had these
problems 10-12 years ago with their trucks, I decided to head off any problems that I knew were coming.
I pulled off & changed several things that I knew were good,,,,, but like me--- they're getting old and tired.
It seemed to run better & better, but still wasn't perfect.
I never could fix the hesitation and stumble when under acceleration from about 1,000 to 1300 rpm.
Without changing a $500. ECM, (that I wasn't going to do) I figured I'd just live with it.
Other than that,,, ya couldn't ask it to run any better.
It finally set a 300--301 intermitent miss code. I thought,,,, "Dog-gone-it, what now"?
It'd have to be the plug, coil, or injector on #1 cylinder.... and they're all new.
Starting at the bottom, I pulled the plug--- totally out of character, it is also the easiest one to get to.
Getting it out--- the wire thing that loops and goes over the electrode was GONE!
The engine ate it..... However it seems to have 'digested' it OK. No signs of lost compression or anything.
So I put in one OEM plug, crossed my fingers, said a few 'Anna-godda-da-vedas', and drove it.
If it ran any better when it was new---- I sure can't tell.