The knock sensor can only retard timing so much, but if it is sensing a ton of knock it will retard the timing so much that you can feel a loss of power. Try high octane gas and see if it gets better, if so you may need some combustion chamber cleaner to get rid of the pre-ignition. I don't think its a converter issue. When they go bad the engine RPM will be higher than usual, i havent heard a converter make a knocking noise.
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