I just had this problem yesterday morning, except I was driving down the parkway at about 55 when it died on me. All signs lead to the CPS going bad. On your dash, do any gauges register, is your engine light and sentry key light on at all?
My jeep is sitting at a dealer 5 miles away, I might go run over there today and play with the CPS wires and harness just to see if that's the problem.
2001 WJ Laredo 4.0L - Sold!
2009 WK Limited 5.7L HEMI