@mhitesh - Changing belts is mandatory at 5 years so do that. What is the kms covered? When did you last service it? Your issue seems to be with the MAF sensor, however I suggest to get the EXAMINER connected at Fiat A SS and check for fault codes. As a DIY you could always open the AirFilter and check the filter if its too dirty - REMOVE it out (away from engine) and clean with compressed Air.