Very well could be your starter is sticking. With the over-running clutch, with the engine idling you sometimes won't hear the starter has still been engaged. Go to switch off the engine and the starter will still be cranking over the engine, the only way to get it to stop is to disconnect the battery negative.
Once the battery is reconnected, the spring pushes back the pull-in solenoid and the starter will no longer engage until given power to start the engine again. I had these exact symptoms and it was caused by a meltdown internal to the starter so I replaced it and that fixed the issue. I'm not sure if any of your symptoms described above are relevant to the engine dieseling.
Perform the test as described in previous post. Check for power on the crank signal or small wire to the starter. If NO, and cranking, replace starter.
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Originally Posted by Siggy
Turned the key off and it kept running. Pulled the key out and it kept running. Clearly I'm missing something here.
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