Phuzy is running a 3.0 V6. That being said - have you ground the ECM to trip it into diagnostic/tune mode? It won't accept a new tune until the ECM has been set. If this is the issue and it solves the tune problem, would you be prepared to try an experiment for me? Use this method to tune your truck and report back with your findings - http://www.mightyram50.net/vbulletin...ll=1#post56600
I have used this on OBD I ECM's and it made a noticeable difference on 4 cylinders, but I can't see any reason why the same (if not greater) gains will be made on the V6 lump.
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