I have a 2015 silverado 5.3 4WD. I've added AFE intake, AFE exhaust, Edge throttle booster, and the edge handheld programmer. Also about to hit 120k on miles. The way my truck acted its making me think fuel system. Same studder, hesitation you all describe. My truck is at a local shop. Tomorrow morning they start on it. Hoping to know something soon. I'm thinking one of the two fuel pumps. Maybe a filter? Also I'm probably going to have the plugs, wires, and maybe coil replaced. Once I know more I will bring back what I learn.