the t app will show kr, and misfires, you can data log with it. scan timing advance long term fuel trim, kr, and load every cylinder under misfires, take a scan. load it to your pc and open it in excell to see whats going on.

i can only guess it stops making power when you hear/feel that sound. if its kr its pulling a crap load of timing out, if its misfires its like all 6 of em lol