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It sure sounds like the Timing is off. That would be from the Belt being off a tooth. The marble sound is Ignition Pinging (knocking).
Did you recently have the Timing Belt changed on this car? It's kind of easy for the Tensioner to take up on the Cam sprocket side and move it a tooth.
I'm not sure the knock sensor would even come in to play if you are running on regular gas and the Timing Belt was on correctly.
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