This phase II trial studies how well combination chemotherapy before and after surgery works in treating patients with localized pancreatic cancer. Drugs used in chemotherapy, such as leucovorin calcium, fluorouracil, irinotecan hydrochloride, and oxaliplatin, work in different ways to stop the growth of tumor cells, either by killing the cells or by stopping them from dividing. Giving combination chemotherapy before surgery may make the tumor smaller and reduce the amount of normal tissue that needs to be removed. Giving these treatments after surgery may kill any tumor cells that remain after surgery.