CNG Cultus VXRi 2010 with EFI. It's having a strange problem. When on CNG, its RPM starts fluctuating(it goes down/up), Sometimes after 10/12 KMs, it gets OK and there's no such prob. But now this happens very rarely that it becomes OK, on petrol there's no problem and it goes on quite fine.
Does anybody faced this issue and found out the cure of this issue please let me know