Q: Ignition off issue.

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So I have a corvette with a custom built supercharged 383 stroker and I have noticed something every now and then after I turn the ignition off. It will shut off but just before it dies completely it sputters for a second then shuts down. Best way I can describe it is I shut the key off and it right as the engine stops it revs slightly and shuts off. I'm not sure if it's turning backwards or what and it doesn't happen all the time and it's puzzling to me, I don't know if it is something I should be concerned about?
My car has an automatic transmission.

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