Dear Sarfaraz,
I am agreed with Mr. Hassan, Remake of Throttle doesn't work properly, so go for Kabli Throttle, and the Oxygen Sensor which is indicated by Hassan must be out of order, these two things will resolve your problem, and also if you have time, then must clean all of your Baleno's Sensor with Carborator Cleaner or petrol. your car will be as smooth as ideal.
Regards,