I bought a 2002 Subaru WRX two weeks ago. It is all factory except the SPT exhaust and BBS wheels. The car has just hit 46,000 miles on it. Well its getting colder now in the past 2 weeks in PA and sometime when letting the clutch out to pull away from a complete stop it seems like the clutches "shudders" and the car shakes. Doesn't do it all the time seem more noticeable when cold. Has anyone had this issue and what do you think is causing it.