Recently, I bought an '88 HB from an older lady near Tacoma, WA. It had 131,000 original miles on it. Had a nice Sony stereo with the faceplate, but she said the radio didn't work. Idle was a little up and down, but you could tell the clutch was new, brakes were brand new, and the motor was solid. No smoking, no noise, plenty of power. She also said it hadn't been driven in more than a year except for a start-up every couple of months.
I get this truck home and a few things go wrong. Idle gets worse, engine light comes on (code was for the EGR) and then I noticed all the tuneup parts were pretty old. Also a slow drip from the front of the water pump.
Shop says: 'Your manifold gasket is bad. Your EGR is bad.' They charged me $120 to tell me this, then said it would be another $450 to fix, plus the cost of the EGR.
Yeah....
I limp this truck back to my house and start paying for new parts instead. I got to work. Here's what happened:
New intake manifold gasket installed.
New wires and plugs, cap and rotor.
New battery.
New EGR solenoid.
Radio fixed. You gotta snap in the faceplate correctly.

Changed oil.
Replaced a ton of hoses with new ones, and ditched the stock clamps for modern ones.
New water pump, flush cooling system.
Engine light goes off, does not return.
I'm taking it to a
different shop now for the final tweaking for the emission controls. Shouldn't be much, it runs pretty good now.
Did all this work in two days. And this is my first Nissan since a 720D I owned back in 1996. My last car was a Suburu 4WD wagon, a 1987. They will go anywhere, but I wouldn't have another one. Ever try to work on those boxer engines? Tough.