Master g is absent for long,
anyhow if the car is at cng drive it at low speed under 20 km/hr in second gear and give it a sudden boost and check if it back fire or listen keenly any blast of air filter,if any then be ready for spending on its electrical systems,drive it in all gears on cng with a/c.
Other things may involve outlooks of the car,put it on deck to underview the rust or rust treatment if done and to the suspension,look inside the doors and pannels,keenly observe its body segments well aligned or not, touching doesnot matter much because driving in pakistani traffic is a great piece of skill.
Watch the behaviour of exhaust,it should not give smoke.
