On my way to work this afternoon I was stopped at a light and when I put it in 1st and hit the gas to go my rpms shot up but the car would barely move. It doesnt do it all the time but mostly only when I get on the gas pedal hard through 1st, 2nd and 3rd. Im also sure I need a new master cylinder because of the fluid leaking inside the firewall but would a bad master cylinder cause the slipping or is that basically a bad clutch? Another thing is my clutch pedal seems to engage too soon and disengage too late.