86 pickup dies but restarts ok
 

help please! my nissan built in 9/86 with f/injected 6 cyc. runs great but dies at odd times. going slow or fast(which is really unsafe on the freeway) I can shift to neutral (auto) and restart. I tried to trace wiring problem but my chilton has different wire colors in the schematics. where can I get a correct schematic or does anyone have any ideas on the problem, say from simular experience. thanks