One problem related to vehicle shudder has been reported for the 2002 Subaru Impreza Wrx. The most recently reported issues are listed below.
I have experienced "clutch shudder" on my 2002 wrx. The dealerships I have taken the car to (3) said they could not reproduce the problem so have left it unaddressed. The car shakes violently like it was being jackhammered when first driven. No dealer will repair it under the TSB that was issued by Subaru.