This phase I trial is studying the side effects and best dose of suberoylanilide hydroxamic acid when given together with fluorouracil, leucovorin, and oxaliplatin in treating patients with progressive metastatic or unresectable colorectal cancer or solid tumor. Drugs used in chemotherapy, such as suberoylanilide hydroxamic acid, fluorouracil, leucovorin, and oxaliplatin, work in different ways to stop the growth of tumor cells, either by killing the cells or by stopping them from dividing. Suberoylanilide hydroxamic acid may also stop the growth of tumor cells by blocking some of the enzymes needed for cell growth. Giving more than one drug (combination chemotherapy) may kill more tumor cells.