When I purchased the stang in the fall it had a bad throwout bearing (the signature little squeal when the pedal is not depressed), so I had it replaced. Recently, ive been having an intermittent problem where the clutch pedal begins to vibrate vigourously accompanied by a rattling, squealing sound from under the car (sounds like chains rubbing together and a squeal alot more... angry... than the throwout bearing squeal). This happens in any gear and also in neutral, and it happens when the pedal is not depressed. Pushing in the clutch a little solves the problem. Some days the car will drive perfectly fine, and other days it has this problem. Does anyone have any idea what could be causing this?