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No power, missing, poor mileage, black smoke. P1211 p0284
Having some trouble with my truck. It will run well for a while (between 20 min and 2 hours) then will begin to lose power, puff black smoke and chug along. When it's running fine, there is a slight miss, but I'm not familiar enough with these to know if that's just how they sound as I've only owned it for 3 weeks.
Once it starts to chug, it will throw a CEL. I can pull over and turn off the truck, letting it sit for 10 min or so then fire it back up and it will run decently for a while, but still not perfectly. The cel will also clear, but will come back pretty quick once I start going again.
Power loss is to the point of barely being able to move pulling a 6k lb trailer, but it will run 75 when it's running decently. Power loss is progressive over the course of 5-10 miles.
Injectors are stock and when I took it to a mechanic yesterday he thought it might be the #8 injector, which failed the contribution test.
Empty running 65-70 mph I got 12.75 mpgs and pulling this ~6k trailer, its looking to be in the 7mpg area.
Anyone have any thoughts? I'll keep thinking of extra details to help diagnos this, but that's about it right now. Thanks guys.
'11 F250 6.7 CCSB Lariat