ok i jus bought this car from a guy and he said the clutch was out but while its in gear and the engine is off the car rolls jus like it would if it was out of gear. there is no noises coming from it while its rolling. when the engine is running and its in gear i can let out on the clutch and rev it up and it wont go anywhere or try to stall. what can this be? do i need a new tranny or what? any help would be greatly appreciated.