Q: Car starts but dies right away. New Key, tried a different ignition switch. on 2002 Saturn SC2

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My compass shows voltage. The car starts, then the voltage goes to 7vdc then to 0vdc and dies. The car runs good, the engine starts right away but dies in a few seconds. I wonder if it is the computer or the security system. The car worked fine for a couple of days then it came back again. Since it is not the ignition switch what could it be?
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