I just bought an '05 Lighting. Seems to run fine except it misses a little on trailing throttle. I'll run it up to 2000-3000 in second gear and ease off to stay in the speed limit. Then it will miss intermittently. Doesn't seem to do this when I'm accelerating. And it's not as bad if I up-shift. It's just at that point when I'm neither accelerating nor decelerating. Any ideas?