OK, I'm doing it in two steps. First step is to undo the damages done by idiot roadside electricians and CNG guys. While I'm already working on wiring stuff and connected a few important pins. Plus DLC has also been connected.
Based on my requirement to cut the injectors on gas and all four injectors should be working on petrol, the idiot electrician had joined all four injectors from ECU and then installed a transfer relay to feed the four injectors. That meant on petrol, all four injectors were running all the time :S
Took me some time to analyze what that guy had done. Now I have reconnected all the four injectors to ECU and devised a temporary way to cut off injectors when on CNG by means of switches. Have to move to Lahore tomorrow, so on my way back, I'll replace the switches with relays, IA.
Idling: Like a pin drop silence (virtually) both on petrol and CNG. Just loving it.
Alhamdulillah, the motor was able to withstand the torture for quite some time. Now things moving in the right direction...