Jeep engine keeps shutting off

I have even changed coils and spark plugs

I have the same problem although, mine is intermittent . After taking it to my Jeep dealership,and still not finding the problem, I e mailed the Chrysler Corp. and told them about the problem. They told me to take it back to the Jeep dealership and run a complete diagnostics on their machine and they paid for it (it costs quite a bit otherwise) . After they did that and checked everything else under the sun they still could not find the problem . My 04 is a 4.7 Grand Cherokee. I know that this doesn't help but if you do find the problem I'd appreciate knowing what it is. I hope that you find the answer.