I had a problem with my clutch where if I had the pedal depressed (clutch disengaged) and revved the motor you could feel the engine pulling the car a little bit. It wasn't fully disengaging.
I would look at the slave cylinder. Check and see if there is any brake fluid seeping from the bottom of the transmission bellhousing. The slave cylinder could be leaking and not able to fully disengage your clutch.
If that is the case, you have to pull the trans, so get a complete clutch kit.
warmonger
