Hi. I have not tuned diesels before and I started with a '02 Silverado Duramax. I downloaded the tune from the car and made adjustments to it according to one procedure I found from this forum. The outcome was a little unstabile idle and jerking on high rpm.
Later I got to think whether the tune I modified was original or not.. I found few tunes from repository and in those tunes injection timing was way less in "power areas" than in my tune.
I attach here the original and the one I modified.