It sounded speed related to me. Either way, you're not in for an easy fix. I would check for a loose flywheel if it were me. Just so you know, you're motor and/or transmission or more than likely coming out, so just make peace with that now. But like croustibat said, Stop Driving The Car. The more you drive it, the worse it will be, if it's not too late already.
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 in any situation....thou shalt blaze
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