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Engine Rattles and wont turn off

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Old Oct 21, 2018 | 09:58 PM
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Default Engine Rattles and wont turn off

I have a 00 Vette and when I start the car the engine has a terrible 'metal rattle'. Further, when I turn the key to the off position the engine doesn't completely turn off, but rather lugs along at a low idle struggling to stay on. Only by revving the engine near 5-6000 RPM can I get the rattle to stop and then the engine purrs. Please help!

I tried to upload a video but it didnt work so I uploaded to my youtube page and attached link below for help in diagnosing:
Thanks in advance!
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Old Oct 21, 2018 | 10:23 PM
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couldnt tell from vid but most likely a timing or octane issue and yes either can cause motor damage
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Old Oct 21, 2018 | 11:51 PM
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Moved to C5 Tech.
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Old Oct 22, 2018 | 10:19 AM
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Originally Posted by joesephus
couldnt tell from vid but most likely a timing or octane issue and yes either can cause motor damage
I have only use 91 Premium fuel always. Also as for timing, wouldn't it still persist after I rev the engine high? After i rev the engine high, it stops immediately and i can drive around all day without a problem, but when started cold it comes back. I should mention that the previous owner has an aftermarket air intake on it but appears to be for looks without much "mechanical " change.
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Old Oct 23, 2018 | 06:39 PM
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Take the valve covers off and check the rockers and springs.
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Old Oct 24, 2018 | 08:51 PM
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The running while turning the car off sounds like an octane issue to me. I would try octane booster and I’m sure you’ve checked all essential wires and sensor connections. I’d even check fuses before tearing valve covers off.
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