Hi Trbankii,

You may be right! The engine has not been professionally tuned at a Diesel shop. It is at such a shop now and along with installing a turbo they are tuning it also.
They told me that it was needed. A turbo installed would increase the efficiency of the vehicle and just yesterday my mechanic told me he has a way to get a turbo into the vehicle. Is it true that the Duramax diesel is more fuel efficient than the 6.2 because it is electronic? (That can bring along a few more headaches of its own)

-Madrugador