I've got the same problem as the OP. Mine happened last night. Driving to the movie theater, I started getting a horrible vibration in the clutch pedal as I was driving. Both engaging and disengaging the clutch. Came out of the movie, and it was gone. The car has been running normally all day. Did you ever get a response or any kind of resolution from SOA? I'm gonna be stopping by my dealer after work tomorrow.