Hey guys, i have 2005 Civic Prosmetic 130k done, i have a strange issue let me explain, while driving on CNG it autoconvert to Petrol and never converted back to CNG dont know what happened, and started missing/jerking in starting on Petrol i mostly runs on petrol. After running of speed 20 it works fine.

*Removed All CNG Wirings already
*Checked All Coils they are good
*Checked Injectors they are good
*Mechincs Said First Cylinder is not working :/

What do you guys suggest what should i do ?? i never had any issue before that.