I had a similar problem with an older stang I had, the starter would keep running even if I took the key out of the ignition. My problem was that my solenoid was sticking. I assume yours would be a remote solenoid on the firewall, but if you have a high torque starter, then it'll be on the starter itself. As far as the entire shutdown, I'm sorry but I dunno. What will it do now? Will it turn over or is it just completely dead?
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