For the past couple of days my Jeep will just shut off while I'm driving down the road. It's doesn't sputter, buck, cut in and out or of that, it just shuts off. After about 10 to 15 minutes I can start it back up and drive away, sometimes if I get lucky it will start right away but not often. I checked the fuel rail and there is plenty of fuel there. I was told that it could be a crank sensor. Any ideas, or thoughts? The jeep is a 2001 cherokee with the 4.0