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1990 Nissan Pickup (D21) Questions

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My truck started overheating so I checked the water and added some but no puddles under where was parked so I checked the oil and there is water in the oil, what could be the main cause.
heater fan stopped suddenly . fuses are ok where is heater blower resister
I have a 90 Nissan D21 Pickup. It Boggs and sputter when it reaches operating temp. I've changed fuel pump, fuel hoses, fuel filter, egr valve and solenoid, vacuum lines, iac valve, coolant sensor, injector seals, timing chain, new exhaust, o2 sensor, tune up, new distributor and new water pump. I really need some help, can't figure out what is causing the problem.
Can't find parts anywhere
When I pull off in 1st gear my engine stalls and shut off. It only does it in 1st and 2nd gear. Can someone please tell me what can cause this to happen?
I put a new fuel pump in my 91 Nissan 4 times in the past 7 months. It runs fine for a little while. And then it starts sputtering when I accelerate. Especially up hill and then cuts off. But it idles


It sputters and backfires really bad. I've changed out spark plugs and wires, coolant sensor, o2 sensor, IAC valve, EGR valve, MAF, distributor and rotor caps, catalytic converter, fuel pump and filter, seals on fuel injectors, timing chain, vacuum lines. I done everything I can think of and its still sputtering and backfiring. Please help me, what am I missing?
What seems to make the problem better or worse? no change hot or cold
How long have you had this problem? for a couple months
It use to not be that bad,and it would run good after driving it for few days ,now get where it barely goes at all
How do I fix it
every bump while I'm turnijg going straight its fine
My friends 1990 d21 hardbody runs great when cold but dies when it warms up and won't start again until it cools off
I need another spindle for a 1990 nissan d21 pick-up and found a 1995 nissan d21 pick-up at an auto salvage.
my TCM unit is not working will this unit i found work?
Can any parts off of a 95 Nissan pickup fit a 89
They light on panel about Brake is on
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