I have a 2003 5.9 with 273k miles I have a air dog lift pump . Edge tuner . 4 inch straight pipe . Even when its warm out it takes a long time to start. I just replaced the prv . When the truck is running it idles fine and has plenty of power. Any ideas ?

 

Im having same trouble. 2003 5.9 277,475
i started a thread also . not sure if its in the rite place or not

 

Check your injectors. CR have problems due to poor filtration. injectors may be stuck open. I have a truck that did that and he drove it so long it washed number 6 cyl out.

 

How many miles on your injectors? Original injectors?