oiving

Please read all the symptoms:

Great running 1990 Hyundai with fuel injection
and an automatic transmission. I've had it since
brand new, keep it tuned and oiled, etc.

Driving to work three weeks ago and *suddenly* it
just died taking off from a red light. No warning
and no gradual death, just died and I had to put
it in neutral and coast to a side street.

No gasoline smell. Nothing disconnected from the
distributor to the ignition coil. All wires look
good.

Cranked great, plenty of juice to the coil and
distributor cap, but *no* spark at all. So, I
replaced the ignition coil, the connector to the
distributor cap, the distributor cap itself.

Started right up.

Drove for two days, then it died *suddenly* again.
Exact same symptoms. To make a long story short,
it has happened inumerable times since then: runs
for an hour or five minutes or half a day, and then
*suddenly* stops running, even though it cranks
fine: *zero* spark. Again, it cranks fine, but
no firing.

Test for bad fuel pump by spraying starter fluid
into the large hose from the air cleaner to the
fuel receptacle: nothing. This tells me it's not
the (new) fuel pump. Must be electrical, but where?
Computer?

I'm hoping that anybody reading this will look at
all the facts I'm posting before responding: cranks
fast and furious.. but no spark. Then, after replacing
the coil and wires (wire from coil to cap replaced
three times) it'll start and run for a while. Why
does it run for a while on a new cable then die again??

Help with this would be greatly appreciated as this is
my only car (I'm poor). :O)