03 6.0L modded missing problem
I'm kinda fishing for some ideas here. I brought a 03 6.0L, had to do head gaskets right away, I'm a beginner diesel tech and did them myself with some help. But anyway while I was in there I upgraded to a 06 HPOP and rails. I also added a stage 2 vgt turbo. I got it back together and it ran fine but couldn't spool the turbo on the stock tune, so i added SCT 3015 Performance tune to it and that helped the spooling but created a miss when cold. I scanned the truck and did a buzz test and all. There are no injector codes, I then added the blue spring upgrade and that made it worse. When it misses it does it so bad it want to stall the truck but if I baby it along till it warms up about 5-7 miles it clears up and runs great, also when it misses it smokes grey to the point it will make the cars behind me disappear. Sorry for the long story just trying to get all the details out. I'm going to try and check fuel pressure tomorrow and take a video of it acting up to post see if anyone had this before.