Jeep WJ Problems

My Dad's 2000 Jeep WJ with the 4.7 V8 keeps dying while driving. The gauge cluster will then show the MIL,check gauges, low fuel light, key light, and fuel gauge shows empty (even though it is full). It also shows a P0443 OBD2 code. Changed the purge valve, just to be safe, didn't fix it. It also has a brand spanking new battery, that didn't fix the issue either. I'm about to tear my hair out. Any ideas?