So I noticed after disabling Auto Start/Stop with FORscan that the engine stumbles at stoplights for the first 10 minutes or so.. I dont recall it being this bad before disabling the Auto Start/Stop but then again I rarely manually turned it off. At first I noticed switching to Sport mode or turning the A/C off makes the stumbling stop. Only once have I had it stumble with Sport mode. Has anyone else experienced this? I did replace the plugs and that made no difference. Truck is a 17' with 24,000