AoA, I have a manual 2001 vitz which was working great till i got my car serviced 3 days back. Firstly it started giving JHATKAS which were rectified by cleaning the spark plugs. Than there is this new problem That my car gear box is quite smooth in idle. but as soon as I start to run my car the gear gets quite hard i.e. it feels as if something is stopping it from changing gear. I also got my gear oil changed. Please help