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there are two possibilities for this,
* the engine get fuel, may be because of broken or stuk open idle solenoid, even when the engine is turned off still fuel is supplied to the conbuston chamber. * well you have turned of the ignition, still the engine runs, sure the engine is hot and there are carbon deposits in the combustion chamber which are hot enough to ignite the fuel mixture in the combustion chamber. or else the the exhaust valve edge around the valve head is so thin therefore it stays at red hot to ignite the fuel mixture in the combustion chamber. your engine will stop running if you can stop one of the two possibilities.
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