2000 Jeep WJ 505

I recently bought a 2000 Jeep Grand Cherokee V8 4.7L 4X4 with about 162,350 miles. When i bought my Jeep it drove good for about 2-3 days then all of a sudden my Jeep stalled out. When it stalls out, my Jeep doesn't buck or sputter it just shuts off like i shut it off.. I replaced my fuel pump, fuel filter, spark plugs, battery terminals, new battery and a messed up oil pressure sensor. The new battery seemed to help but then i found out my battery was bubbling so i got a new one yesterday. Im thinking i should replace my Crankshaft sensor and maybe and Camshaft sensor.. I just put the new battery and new battery terminals on yesterday, so ill see what happens.. Does anyone have any suggestions?? ANY HELP IS APPRECIATED!!