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Yes, quite possibly bad fuel.
Bad fuel is likely bad for being full of water and general crud, all of which would plug up your fuel filter, and that would both set the CEL and make the thing have no power. That said, of course, there are other possible causes, but if it is a load of bad go-juice, the cure is both simple (though expensive) and not covered by DCs warranty.
A plugged fuel filter will not bother the idle or out-of-gear revving of the engine, which after all takes virtually no fuel flow to maintain. It will, however, restrict fuel flow and therefore power when the engine has to drag the vehicle around.
If it is bad fuel plugging the filter, the error code will probably be P00093, and you will need to have the tank drained and flushed, and the filter replaced, which will cost a few hundred dollars. The filter is $40, the rest labor, as the tank needs to be removed from the vehicle in order to be drained. (Don't get me started on the wisdom of fuel tanks without drain plugs -- hardly any vehicles have them anymore.)
Ask them to save you a fuel sample, including the fuel from the filter housing, along with the filter, and then go to see whoever sold you your last tankful. Take your receipt (you did save it, didn't you?). The fuel vendor should pay for the repairs, and will not likely put up a fight, as this sort of thing happens often enough they all carry insurance to pay for claims just like yours. In fact, you probably won't need the filter/fuel sample, although the receipt might be needed.
And for what it is worth, it is suggested you only buy diesel fuel from suppliers who sell a fair amount of it, so you are unlikely to get bad fuel. Also for what it is worth, the other day I was talking with a guy who's job is rebuilding diesel fuel injection systems, and he told me there'd been a real plague of work lately due to bad fuel, particularly water. We speculated together that this was due to lingering effects of last fall's hurricanes and the cuurrent high prices that lead people to use/sell substandard fuel they would have not used before. But who knows.
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