4m50 stutter or chug

[boostin]

Any one with a 05-10 4m50 if you rev it up in neutral to about 2500 do you get a bad chug until about 2000 then it clears?

 

[Amesz00]

Yea kinda. Always just figured it was the way the fuel map is?? Even free revving doesn't blow a single puff of smoke...

 

[boostin]

Mine seems to blow a little blue when I do it free revving. Not oil, has a strong diesel smell to it.