The general consensus is that the tune is the best performance mod you can do on the I6. Most bang for your buck.
That reason wouldn't have anything to do with a dead p/ecm right? Just a loose end that I've been chasing around for a while. As for the tune, I've only had it on one gm small block. It was in the sierra and awoke the beast... but it didn't pan out in the end but made that 6.0l scream better than when it rolled off the showroom floor. Shift points snapped throttle response instant... it was sweet. The 5.3 should respond in a similar manner I would think. These trucks move very well in stock form. Sorry this doesn't really help you that much.Yes, My wife's Denali has a 5.3. I also only use EFI Live, won't use HP Tuners for a personal reason that won't be shared in an open forum, but it spans back almost a decade and has to do with Duramax diesels, so nothing with these nice vehicles.
So you did end up with dead components? I only ask because the sierra killed 2 pcms with a tune. Only under the circumstance where the throttle body opened all the way. I found out that there were a few incidents that were kept quiet. The tuner had no knowledge of the issue either.Dead ECM and TCM's don't even scratch the surface of that issue. But to keep the peace, I'll let a dead horse rest in piece.