Q: No power when talking a hill pedal to the floor high rpms

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I was told when I bought it that it was a misfiring cylinder. I've changed the spark plugs, coils, replaced plug wires it seemed to run better at firsthand, than Right back to having no power. Would o2 censors cause this or bad sensor elsewhere?

My car has 192000 miles.
My car has an automatic transmission.

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