2019 5.3 AFM engine. When cruising 50mph TC locked any small hill or slight acceleration it has a consistent misfire every few seconds only when the TC locked. I read many articles and some say 89+ octane takes care of their issue, some say it’s the cylinder deactivation kicking in and out. But it’s more of a misfire. I feel the CD all the time and it’s not that. I haven’t talked to the dealership about it yet. I don’t need some parts cannon tech ripping through it. Thanks for any help.