Mitsubishi space, automatic transmission, cold start, gearbox is not easy to use. Ask someone for advice.

Maybe the transmission oil pump is worn and the pressure can't be pushed up. After the hot car, the oil will flow faster and better. Can you go to a professional place, such as a 4S shop, where there are professional diagnostic equipment? If it is expensive to repair, 1997 car will be scrapped and bought a new one. Your car costs one or two yuan a kilometer. After so many years of use, the gas is not worth it. Moreover, the transmission is very old, and it is estimated that there are no accessories, otherwise people will definitely let you change the oil pump when they take it apart and wash it.