Throttle body ki service kerwain,rpm adjust kerwain ,gas ki computerized tunning and air pipe per tape check karen.
sir aap ki car hunted lag rahi hay im joking.battery ki ph check kerwain and change it because its very old iss k 2 or 3 cells must khatam ho chukay hoon gey.so change battery and then tell.
dont use cloth use a piece of tape to cover half face of pipe so it can run smoothly on cng other wise air ratio will increase and car will start jerking on low gears with pick problem
sir agar tak tak ki awaz hay to its not bearing its chimtas bush change then may be foundations bi ho saktay hain but baleno k chimtay weak hotay hain zaida masla inn ka hi hota hay.