In skillet lightly brown the sausage.
Add green pepper and onion.
Cook till vegetables are tender.
Drain off fat.
Stir in tomato sauce, macaroni, sugar, chili powder, 3/4 cup water, and 1/4 teaspoon salt.
Cover; simmer till macaroni is done, about 20 minutes.
Blend in sour cream.
Heat through but do not boil.