Well after a bumpy start with my 03 lb7 that had [most likely efi] that the dealer could not find after selling it to me that way [bought used]and keep limping the trans. Final reprogrammed the ecu and is now at stock, I
installed a Mangnaflow 4" turbo back S/S exhaust and an Airard cold air intake system, seems to have quicker throttle responds and a nice deep exhaust tone. I'll be able to tell better when I pull my 5th wheel camper.
Thought about the edge or other programmers but it seems sooner or later there seems to be a problem with what ever you install so I think I'll stop here for awhile

That's cool, I know what you mean, once you start you can't stop. Trust me, this isn't going to be the end of your thoughts on a programmer :D

Odds are your tranny is hurt. Any additional power may limp it again. I would look into upgrading the tranny before doing anything else, other than gauges.