Ill suggest u to first check the plug wires and then the coils.
you can do it with the help of any other Baleno which is running fine.
Swap one thing at a time ( e.g. one coil at a time ). There may be a problem in one coil and the other one is fine.
I have the same problem in my Baleno and the coils were found to be culprit. Both coils in my case.
If both the coils are gone then be prepared to get a slap of around 10k for original coils.
Chinese ones are also available for around 3k but ill suggest u to get the originals.
Regards!
P.S. Welcome to the troubled world of Baleno 