Need help determine cause of missfire

AJ/FormS said

Have you been swapping different plugs into 8?
Do you have power brakes?
Are you loosing Brake fluid?
Where is your PCV hose plumbed to?

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Haven’t been losing brake fluid to my knowledge.
The brake boosters vacuum hose goes from brake booster to the back of the intake manifold on drivers side.
Close to cylinder 5