The knock sensor is bad on my Z-32 and I've read a couple of posts on
another site that suggests relocating the sensor to a drivers side head
bolt.
http://twinturbo.net/net/viewmsg.aspx?forum=technical&msg_id=786419

What mechanical problems should I anticipate with a low mileage (approx
36,000) 1993 300ZX that hasn't been driven for about 4 years.  The reason
it wasn't driven is that the owner had health problems.  The car was fine
operating condition at the time he stopped driving it. [I know ...

On my 1987 300ZX power is not getting to the coil everytime I turn the
engine over.  Any ideas?

1993 300Z was in excellent condition, but owner hasn't driven it in 4+
years.
Per the below comment, does anyone have an idea of the cost range for such
repairs?  

I have a 1979 290zx that I'm going to be selling. The engine is in good
shape and the transmission was replaced in 1998 and hasn't had too much
mileage since then.  The paint is faded and scratched by the driver's
door (keyed) and the interior is original, so it's faded and cracked ...