I've been driving mine now for about 2 weeks, it runs good, but I have a bog/hesitation coming off of a coast situation, maybe doing 40 mph, and then slightly tipping back into throttle. The AFR shoots up to 18-20 and it takes a second to recover. It's kind of irritating. If it were a carb, I'd say it needed a different cam on the accelerator pump. I guess I'm going to have to log it and send it to FiTech to figure out.