I have vitz 07 1.0 (automatic transmission). while acceleration it has a huge noise kind of "Dholki" sound, i got it inspected from a local ustaad. he said its find and no issues with it. seems like catalyst converter is removed from it, is that the reason of heavy sound.. as well as car pick is getting low. what should I do, or where should i take it. I live in Wah Cantt and i visited Enercor couple of times but those guys are just ********. they dont even trace a fuse fault. (i had car shut down issue, and enercon guy said its due to coils, i googled, changed the malfunctioned fuse and its running smoothly from that time) any suggestions on good mechanic in rwp/isb/wah. as well as suggestions for Cleaning throtle and get rid of engine yellow light.