After rereading your post sounds like you lost power or ground to something PCM or other,possibly just unplugged connector or a control unit got jarred & lost an internal connection, you need a wiring schematic & start checking for power & ground @ various control units/connectors fuel pump ETC ETC,KISS don't get to fair off course,Neons have crappy under hood eng.to body ground straps that rot away & fall apart.