In a 2-quart saucepan over medium heat, combine sugar, milk and corn syrup. Stir constantly until the mixture boils and is bubbling all over the top. Let it continue to boil for 2 more minutes, still stirring constantly. Remove from heat and add in the chocolate chips. Stir until the chocolate chips are entirely melted. Add in the pecans and mix well. Drop by teaspoonfuls onto waxed paper. Put in the refrigerator until they are set.