Hi I need help I just drove my car for 300km and it was fine. Then after that I can't put into any gear when the motor is running. I tried also to put it into 1st gear when the motor is not running and when I start it the car moved forward. I ask some mechanics, they say it might need new clutch or there is something leaking inside the transmission. My car is a 2003 suzuki aerio sx manual transmission.