I have a 2012 Mustang GT that has developed a pretty heavy stumble at part throttle. It doesn't seem to do it at WOT, if it is I don't feel it. It developed in the last week or so. The only mods are Pypes LTH, High Flow catted H pipe, and a Lund tune. I have reloaded the tune, completed an idle relearn, found I had lost one of the bolts at the collector on the headers and replaced it. Datalog is showing 0 AFR on bank 2. That is not on a WOT pull, just driving around a bit. I haven't contacted Lund yet since it is the weekend. I was hoping someone here could point me in the right direction or at least give me some things to check.
Thanks
Randy
Thanks
Randy