Because they were fine before I did the nozzles for one.
But it could be a combo of both. I have extended crank times when it's cold, including multiple attempts to get it started and when it does it smokes and pops and farts like a cold 6.5 like it has waaayy to much fuel in some and missing in others. (glow plugs are new and working). Then at idle it smokes blue quite badly.
It could be bad ball and seats, sticking nozzle needles or poor needle seats. As they replaced one needle when they returned my nozzles, I'm guessing this is the common problem.