A man and his estranged wife were in serious condition at Maryland Shock Trauma Center in Baltimore yesterday after the man stabbed the woman and himself repeatedly in Annapolis on Sunday night, city police said. According to police, the man stopped at the home the couple used to share at the 100 block of Rosecrest Drive at 9:30 p.m. to get water for his overheating car. He saw his wife on the front porch and attacked her with a pocketknife, stabbing her in the torso, shoulder and neck, police said. He also stabbed himself, police said. The man's 11-year old son intervened during the fight but was not hurt, police said.