Brother, you have to make sure the batteries are good and well too, because sometimes they are tampered, or damaged, possibly even mileage is reversed. This can be checked by accelerating it from a standstill with a charged battery, a weak battery car will of course be slower. Secondly check the gearbox by moving it from a standstill on a charhai, if the gearbox is fine the car will behave normal, otherwise the clutch will slip and encounter some level of difficulty engaging. Jerks at lower speeds around 20kmh are normal but above that could mean Gearbox is damaged. Other than that just normal car things. Oh, also be sure to check the fuel economy it also helps to check the battery! Hope anything above helped!
