again this problem can be due to dirty or choke throttle body...in fact throttle body in baleno is just like heart in a body...the throttle body censer decide to maintain the RPM of engine in response to the signals it receives...when the TB is choke its censer can't decide or time the exact RPM required to cope the load...as baleno has power steering so it directly has a load on engine...so by turning to extreme right or left it orders engine to increase RPM but if TB is not good then it can't manage it and car tends to turn off...similar case is while applying brakes, car get under load, TB don't increase RPM and car turns off...first of all get your TB clean and Install a new butterfly valve in it cause the old one will surely be torn out...(not a big deal its a 500-700 job)
my car had also issues with TB so i get it cleaned, installed new valve problem solved to some extent...but not completely...i was much worried about it..one day a quick thought blinked in my mind i rushed to car, checked its steering oil level and BOOOOMMMMM the bottle was almost empty (the bottle was dirty so i never knew about it)...and after that me and my car lived happily ever after:P:-#(H)