Sketchy on the bends
My GTT used to idle like a dream, a solid unbroken purr that settled down to about 680-750 once the block warmed up. After a track day last year, it got a bit lumpy, sounding like it misfires about once every second or two. You can feel it through the seats and wheel quite clearly. At first it wasn't so frequent, but I think the misfires might be getting more frequent. Open the throttle a bit and it runs perfectly, but let it fall back to idle, and it stutters a bit. Any ideas what normally causes this?