Injector Stuck Open?

I have a 2002 F250 7.3. Yesterday I was driving away from a stop sign, softly accelerating, and all of a sudden a crap load of smoke started billowing out the tailpipe and a knocking sound started on the top end on the passenger side. My injectors have been going bad for a while, I just haven't had the funds to replace all of them. I don't think it's a valve because it's all diesel smoke and crank case pressure is normal, it doesn't putt putt at all, oil pressure is normal, and the knocking sound doesn't always occur if I let it sit for a few minutes and then restart it, but after running for a few seconds it starts again. I had my ICP sensor come loose and leak out 2 1/2 gallons of oil and shut the truck off, so the injectors might have heated up from lack of oil. Is this most likely an injector or something more serious?