Assalam! I bought same 86 model in very poor condition, want to recover it. it was running just on CNG. while there is EFI engine installed. The petrol connection was disconnected. I recovered the petrol connection. Changed the fuel pump, cleaned the tank, changed the injectors with wires (gucha) , changed the throttle body, changed the current distribution coil in delco, changed the plugs, checked the plug wires BUT still there is problem of "missing' at petrol while at CNG it is running well. any suggestion?