Q: Rattle/ Knock from sounds like flywheel

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I've lost about 50% power if not more. When at a complete stop it acts like it has barely any power at all or just dies. Car doesn't run hot. Oil looks good no metal or debris. Used the listening stick and found that the non repetitive knocking or loud rattle is coming from the flywheel area. Is it possible that a bolt on the flywheel is lose or flywheel cracked? What could it be? Thanks

My car has 220000 miles.
My car has an automatic transmission.

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