1990 Nissan Pickup (D21) Questions

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I already have changed the oxygen sensor installed new spark plugs and found some vacuum tubing that needed to be changed. Gas cap appears to seal tight. Where do I go from here?
Changed spark plugs wires distributor cap and rotor still doing it its pulling coats for the air flow meter and O2 sensor injector leak and injector circuit
I have an 88 D21, 1 ton heavy duty with the V6 automatic. I'm looking for a used engine for it, but your database only goes to 1990. How compatible would it be to get a say 1990 V6 engine and tranny??
I have replaced the fuel pump fuel filter fuel injectors o2 sensor and spark plugs and is still doing it it is backfiring through the exhaust pipe and throttle body and sputtering
Alt is new battery is new if you run headlights etc It drains battery
Were gettin 12 volt power in one wire to coil and nothin out
My truck is running hot, plenty of fluid, no heat. How di I replace thermostat?
it started three days ago,it feels like it's stuck in 2nd gear like when going up hill but it's like that all the time.
Has new battery, new alternator, and new starter, what now?
It died when I was trying to start it. It was cranking, then it went completely dead; no lights, horn, tail lights, radio. The battery is charged & I replaced the fusible links (old ones had continuity), checked ignit...
I know its not good to run on 3 cylinders but its my only option right now and i was wondering if theres a way i can cut the fuel off from going down the cylinder and in to the oil to keep the odds of it running longe...
My truck is running well and stops well but the brakes lights do not turn on when brakes are activated! Anyone knows what could be wrong? Thanks
the truck will start sometimes but dies as soon as you touch the gas pedal . the top of the motor is very noisy . once it has started and dies, it will not restart again till the next day .