OUTLINE: This is a randomized, multicenter study. Patients are stratified according to performance status (ECOG 0-1 vs 2), extent of liver involvement (none vs less than 25% vs 25% or greater), and institution. Patients are randomized into 2 arms: Arm I (chronotherapy): Patients receive a 4 day infusion of fluorouracil, leucovorin calcium, and oxaliplatin administered via pump using chronomodulated delivery rates. Arm II (fixed infusion rate): Patients receive leucovorin calcium and oxaliplatin as 2 hour concurrent infusions followed by fluorouracil as a 22 hour infusion on day 1. On day 2, patients receive a 2 hour infusion of leucovorin calcium followed by a 22 hour infusion of fluorouracil. For patients on both arms, courses repeat every 2 weeks until the occurrence of disease progression, severe toxicity, or complete remission for a minimum of 4 months. Quality of life is assessed prior to treatment and 2 weeks after courses 4 and 8. Patients are followed for survival.