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Timing is not an issue when the key is off. There is no timing involved. THERE IS NO SPARK when the KEY IS OFF!!! REPEAT THE IGNITION SYSTEM IS DEAD WHEN THE KEY IS OFF. Its caused by to much air/fuel hitting hotspots in the chambers and combusting. The air/fuel excess is caused usually by the throttle blades being opened to far in an attempt to bring the idle speed up so the engine wont stall. This usually needs to be counteracted by (contrary to what most everyone here is saying) increasing, YES, INCREASING initial timing so that idle speed is brought up and throttle blades in the carb CLOSED down to stop a surge of fuel being pulled in at idle. Or by using an idle solenoid which releases/retracts when the power is off, there by allowing the throttle blades to close cutting off the air flow, there-by stoping any vacuum signal to the carb and stoping the fuel flow.

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Do me a favor, re-read what I said.

You are absolutely correct, when you turn the key off, the SPARK PLUGS STOP FIRING. so once the key is off, spark advance from the timing has NOTHING to do with run-on.

but, if the engine is running too hot and has hot spots in the chamber because the timing is TOO FAR ADVANCED, (admit it, if the timing is too far advanced, you're creating more heat than you need to be, and the engine will run hotter) then even if the throttle plates are completely closed, the engine can still diesel.

does the idle circuit not pull in fuel and air? I think the answer is yes, it does....otherwise, the engine would never idle even with the key on.

retarding the timing a few degrees can make the engine run cooler and stop the dieseling. --it will also hurt performance though, so another solution is to run a higher octane fuel, with more resistance to detonation, which can stop the dieseling.

again, go back and read my post that got you all fired up.