I have a 1999 Oldsmobile 88 that just stopped running 4 days ago.It was running fine no engine issues and when I got up the next morning it would not start.Starter fluid just allowed it to gun up once

Sounds like a fuel issue. I would make sure you have at least 45lbs of fuel pressure at the fuel rail. If not, make sure the fuel pump runs. Chances are you will need to drop the fuel tank and change out the fuel pump.

This may be related to the antitheft system The system is known for turning off the starter and/or injectors when it fails. Is there a light on the dash that says SECURITY or a picture of a car with a lock through it? This is a common problem worth looking into. http://www.diy-gm-security.com/

Do It Yourself GM Security bypass

It sounds like an electrical problem with the ignition possibly the electronic ignition module..You say it fired once with starter fluid ..
Pull #1 spark plug ground it to the block with the wire connected crank the engine see if it sparks and what color is the spark /Orange is bad blue is good ..
You may get no spark.In any case you have to start checking things like the cap / rotor /wires connections to every part in the electrical ignition system .
A lose wire or a bad ground or a broken wire to a plug in connector or corrosion on one of the contacts could cause this .
Their is no magic answer for problems like this you need to look at what you have do some smart tests and narrow down the problem .

Fuel pump or total clogged fuel filter check for power at the pump relay and to pump also make sure wiring and connectors are ok if power and wiring are ok and no pump noise or activity than need to drop tank and replace pump