Well it's a good thing you replaced the clutch hydraulic line... that was my first guess :-)
I gotta agree with Derek... you changed tires and things changed. then you changed them back and things changed for a third time. When you changed back, did you put the tires on the same corners of the car? Or might you have swapped left for right?
How old are all the tires (in years)? Sure sounds to me like out of round/tread separation situation. Don't go anywhere fast until you've got it worked out. Could be tread separation, and that could be caused by some other issue with the steering.. alignment, etc.
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-Matt I ♥ my ♂
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