I have a 2007 Fatboy that started exhibiting a very intermittent engine stalling problem a few years back. Often I could ride 200 to 300 miles and it may stall or I could go 1,000 miles before it would happen. It stalled when I pulled up to a light and I would have to feather it to keep it going. If I turned the engine off , let the codes reset and then restarted it, it runs fine for a long time. I have seen similar threads about this problem with some suggesting an engine temp sensor or vehicle speed sensor or the IAC. I have a great shop in Tucson (they actually work with you and don't gouge you) and we replaced the less expensive items first (temp and speed) and they improved performance a bit. The IAC fixed the stalling problem with my ride and it wasn't bad anyway at $50. I just wanted to share what I found.