Computer problem
1988 Nissan Truck 6 cyl Two Wheel Drive Manual 270000 miles

truck started idled rough cut out started again idle good drove truck for ten miles sputtered and missed upon acceleration truck lacked power ,fifteen miles truck ran and idled flawlessly. shut truck off for ten minutes started truck ,engine cranked but would not start. finally started ran for a minute cut out ,started two more times after that .engine rotates but will not start.i have replaced cap rotor plugs wires distributor coil ignition module fuel filter, checked fuel pressure and fuel pump check timing fine could it be a bad computer.

checked fuel pressure and fuel pump

Did you check it with a fuel pressure gauge and what was the reading ? This is where we start or do below and determine if its fuel or spark problem and then comeback

Get a carb cleaner and spray into the carb or the throttle body on an EFI. Did it start and die? If not disconnect a sparkplug wire or 2 and ground it to the engine -have helper crank engine over-do you have a snapping blue spark? If so-you have a fuel related problem, check the fuel pressure to rule out the fuel filter/fuel pump/pressure regulator and listen to the injector/s are they pulsing or hook up a noid light. No snapping blue spark continue to troubleshoot the ignition system-power input to the coil/coil packs,distributor pick-up coil, ignition control module, cam and crank sensors- Note: If it doesn't apply disregard it