My brother has a 96 Jeep, hes got the exact same problem, for about 3 months in Texas, it sat at the Chrysler dealership, they couldn't seem to figure out the problem... well they replaced something (not exactly sure what it was) thinking it would fix it, and it still didn't work properly. We moved to Virginia, and hauled the thing on a trailer being as unreliable as it is. We heard something about the Catletic (sp?) Converter, got it replaced, still nothing, we bought a new alternator and the battery, still does the same thing. We took it to my grandpa's who's worked with cars since he was in the army, he got to messing with the computer (not exactly sure because being as young as I am I don't know much about cars) but there were 3 main plug-ins and we got to moving 2 of the around (while the car was on) and it shut off just like it would when were driving around. We tired strapping them down with plastic straps, but it still misses as we are driving, so maybe replacing the computer as somebody else was suggesting could help, which might be the route were gonna take.