Have 2006 5.9 Diesel with tuner, what would cause in neutral or in park when you step on the accelerator for the RPM's to go at full RPM's and then come down to an idle?

 

For future reference:
https://dodgeforum.com/forum/dodge-r...s-section.html

 

in other words you are just intentionally free revving the **** out of it in neutral?

 

NO, not hardly. I mean step on accelerator and than step off and it still hang up there. Just had it in DYNO Days in Missoula, Dyno read out stock 898 torque and 455 horsepower, just want to correct smoke and make sure I don't need to change out injectors???>?

 

What tuner?

 

sounds like somebody smarty tuned your ECM...or used some kind of tuner/programmer...otherwise you would have a check engine light from just injectors and no programming or boost fooler...