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Probably neither. I'd assume it's a condition called "dieseling" or "run on". If the vehicle is carburated it will continue to draw fuel as long as the engine runs. When an engine gets a little older it builds up deposits on the piston and valves. The deposits get hot, glow red and when the engine is turned off, fuel mixture comes in contact with the glowing deposits and keeps the engine running... sort of.

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Q: Will bad sparkplugs affect your car turning off or could it be the ignition coil?
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