I have a 1999 Concorde lxi with 158,000 miles. Every couple days when I drive to or from work, about 5-7 minutes into driving the engine will just shut off (and the cruise control light comes on). Then I pull over and turn key off and back on again and engine starts back up like nothing happened. And one time it shut off on the express way and I coasted for about a quarter mile and the engine came back on and I drove all the way home.There is no check engine light or code stored. Anyone have any ideas what to look at?