Hey LINSIH,
The shutting off problem would be something different. It sounds like you have an ignition relay that is sticking, here is a diagram that will show you were it is. When you shut the engine off and it is still running try pulling the relay to see if the engine shuts down.
Please let us know happens so it will help others.
Best, Ken
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Thursday, February 23rd, 2017 AT 12:48 PM