The auto shut down relay (ASD relay) on a 1991 Dodge Spirit is a critical component in the engine management system, responsible for supplying power to the fuel injectors and ignition system. If the relay fails, it can cause the engine to stall or not start at all. To diagnose issues, you can test the relay using a multimeter or swap it with a known working relay. If the ASD relay is faulty, replacing it should resolve the issue.
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