I need help as my Vitz 2007 Model is feeling heavy on CNG and on Petrol and while its acceleration when I apply brake to slow it down a bit and then put accelerator down it does not give any response on cng and when converted to petrol it does same problem but it does give response i mean start acceleration but after a jerk.
Visited couple of mechanics one suggested to get throttle body cleaned for 1500RS.
Other Suggested that CAT needs to be removed and throttle cleaned for 2200RS.
Please give suggestion as I am confused in making decision.
Edit: Done with both and its fine now Masha Allah. Also got the culprit removed(CNG) as its of no use due to very less difference in cost per millage.