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Often times you wont even hear knock inside the cabin... seriously theres ALOT of misinformation in this thread, QUIT scaring him.
1) Possibly a loose heatshield (exhaust manifold, cat converter)
2) Busted cat/muffler
3) Possibly old plugs
And alot more possibilities,
Change the fuel filter first and check the vacuum hoses.
Shell V power is just full of marketing bullshit, its nothing more special than any other high octane gasoline. I personally dont buy that stuck ring stuff, I've seen piston rings in various conditions in various cars, even after detonation. I've never seen them stuck, unless piston was damaged by detonation so that it squished all the rings in the lands.
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