@andaata. Brother you should contact @hasnain2005 and @fzaman, they are satisfied Liana owners like many others over here.
I have read in the forums that Suzuki 3S workshops have some arrangements to tune Liana as they have its special software and a team of people comes from Karachi for this. Check with local authorised SUzuki workshops when that is going to happen and take your car there.
I once went to F-7 Enercon long time ago, and they really messed up my Khyber and when results were not good told me to get the carboreuter opened and cleaned. When I checked their computer it was running a trial software and it was a general kind of software, not very detailed one or engine or car specific.
Liana is much advanced car than a Khyber and I am sure that they will ruin it. Only Suzuki has the special software and computer for Liana.