Have f-450 2007 ambulance.When off idle ,power balance shows
1,3,5,7 cyls wack.Ran the bubble test as seen in the article section ,but saw no bubbles.Customer states that when it warms up,problem disappears.Passes koeo and koer test and buzz test.fuel presure good under load.Performed ficm update,believe it or not this had never been done,Truck seems to run better when cold but not solved.This leads me to believe I have some bad injectors.REmember something about fuel rail dampener sticking,broke causing issues on one bank.What do you guys think?