It's good to see that you're satisfied Congrats then, Hunt for some good mechanic in your town and enjoy the comfortable ride. No doubt there's no better competitor of chevy exclusive in Pakistan in this range.
Regarding registration process, sorry I don't have any expert knowledge in this regard. But I'm sure there would be many other threads here focusing on the similar topic. good luck
Have you checked spark plugs and cables first? If not do it as a first step and replace if required. Go for original cables rather than local. You can buy original stuff from Nexus motors Karachi. Remember original stuff should has sticker of GM (General Motors) on the packing material.