Strong when do not have any codes, but I have a miss fire on cylinders 2,4, & 6. I am running E3 plugs and I suspect that is the problem so I am changing then tonight for Bosch +2's. I had E3's in my "C" and had to pull them for the same reason...miss fire code. Exhaust is all buttoned up and the cutouts are working :-). A little more breaking in and then time to hammer on it.