Bob
Please provide your date of birth, accurate time of birth and place of birth. If Saturn and Rahu are in the star of a planet which signifies good houses then the combination will do good to the native. If they are in the star of a planet which signifies evil houses, then the combination will be malefic to the native.
It is in the Vedic astrology that the combination is bad. The reason I do not know.
Good Luck
JVS Rao (KP system follower)