Had a new clutch fitted to my 95wrx 4wks ago on warrenty from the garage I purchased it from. When I rev up to pull off quick it slips like hell throughout all the gears. After a few miles the sliping goes completely and the car drives awesome until the next time i rev up to pull off. Is there something leaking on my clutch plate? is the clutch plate too weak? please help as I often loose out to lesser cars at the lights due to this niggly fault.