Are you using a key that you had made? This is what happened to me when I tried to start my 2006 Commander using a key that didn't have the electronic chip in it.
If you can get a code reader on the car, that might help. Most common causes for an engine to die right after starting are idle air control valve system, MAP/MAF sensor, engine coolant temperature sensor, faulty ignition coil, and maybe the fuel pump or its relay.
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