This does not happen every time but sometimes when I pull hard it kind of stutters on the higher end of the power band. I am hitting target boost but every now and again it will hit a little speed bump between 5500-6500rpm. It usually comes with a CEL as well. One time it was a cylinder 3 misfire, and lately it has been an 0442/EVAP small emissions leak. Changed the plugs and after the ECU reset it was running like a champ. I am thinking about checking resistance on the coilpacks and making a grounding kit. Anyone have any ideas?