 RATIONALE: Interferon alfa may interfere with the growth of tumor cells. Interleukin-2 may stimulate a persons white blood cells to kill tumor cells. Drugs used in chemotherapy use different ways to stop tumor cells from dividing so they stop growing or die. Combining interferon alfa with interleukin-2 and fluorouracil may kill more tumor cells. It is not yet known whether interferon alfa is more effective with or without interleukin-2 and fluorouracil in treating metastatic kidney cancer. 