i think im having a similar problem to you... I wasnt running an KR on a 3.4 SD headers n canned tuned from ZZP. With the colder weather, i was merging on the highway and did like 3/4 throttle n saw KR for the first time. I pullied up to a 3.5 and still seem up at higher RPMS n speeds, around 0.2 to 1.6 ish. Not sure if its false KR or what....I do know that when i go in reverse i can hear a loud grinding thats apparently coming from my front 02 sensor from the new headers n making contact with the body. So idk if thats the problem with false KR or what....any new info after the new O2 install?
