Any help is greatly appreciated! The problem is that the truck is running strong right after it was tuned.... The problem is that when I put fuel in it, it acts as though it was never tuned for around 5+ minutes of driving time, then it goes back to normal A/F readings in boost, but loses power? And the truck readjusts the fuel tables all on its own? Is there something that needs to be disabled with the flex fuel settings/tables?