my friend has an automatic sepctra, we bought it for 505000/- CNG fitted, it was 2001 model
It works perfectly fine. engine is not showing any sign of weakness after 78000 Kms, No smoke, no oil reduction, sound is also perfect. U need a good CNG person to do that for you. I can guide u about ISlamabad, i dont know about Lahore, but i have seen many Automatics with CNG. u should keep on searching for a good person.
My advise is not to sell it. use it and enjoy it,u cannot find any other car of this size and accesories, and u can park it in your street easily. Its not a favourite for car theives