When I drive for a long period of time..say over 2 hours straight in 5th gear and then step on my clutch pedal and put my car in neutral my clutch pedal feels REALLY REALLY SOFT..like there's no pressure/tension..sometimes like today i drove 3 or 4 hours straight and when i pushed the pedal in to disengage 5th gear the pedal wouldn't come back up without me pulling it back up with my foot. After about 30 seconds of pressing the clutch pedal in and out it finally had some pressure behidn it..anyone know what's wrong? Maybe master or slave clutch cylinder or whatever? Is it easy to fix? My clutch seems fine cause when I drive short distances or in the city it feels stiff like it should.