@rajaatta bhai I swapped 2szfe in Vitz, which was a mess as it happened in my absence. Anyways I rectified almost all the issues. Now only 1-2 issues left.
When I drive the car specially in lower speed / gentle acceleration, the car seems like it is not getting in next gear (happens only till 30 km/h, after that the car runs smooth) and the same doesn't happen when I accelerate aggressively. Same is the case when AC is turned on, but with little more intensity.
In both cases the car works well including gear shifting when accelerated hard. Now I can't drive aggressively all the time in congested areas. What could be the reason?