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I never quite understood what causes an engine to continue to run when the key is shut off. That is it runs for a few seconds and then it finally shuts down. Is it that the cylinder has some type of debri in it that gets so hot that it glows and continues to fire the cylinder?
 

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Yep! You got it. It's called "dieseling". Are you experiencing it?
Try lower your idle RPM and check your timing. That will often stop the run-on.;)
High engine coolant temps can cause this as well. If you're running like a 195 thermostat, try a 180. If the engine has cooling problems, then that needs to be addressed too.
Starting back in the late 60's or 70's, GM used a anti-dieseling solenoid device that closed the throttle plates completely, shutting off all air & fuel to the engine to combat just this problem.
 
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