Ws6, I understand where you are coming from. My mother passed 2 years ago. She was a great woman who raised 7 great kids.
As for that car:
If it's like the 2001 Impala we had. It has 2 egr valves, one under the hood, one in the back, and both go bad with age. If it not the gas cap, just replace both and they will be good for a long time. If one went bad, the other will soon fail, so no need to figure out which one. Do both.
If it has the plastic coolant hose that was upgraded to metal, do the upgrade and a new thermostat, and any bad looking hoses. If there's even a hint of moisture leak of the Radiator do that also while your at it. No use loosing a coolant fill soon after If you stay with a Radiator that old. Don't flush with any flush chemicals, just drain, service any cooling system parts requiring attention, and refill.
Those have an under the car fuel filter. And with that many miles it ready for replacement. Disturbed the brake lines near it as little as possible. They are easily damaged when they are that old, and they are a factory pre-bent and likely no longer available. So, if required, custom bending new ones will be required, and that ain't cheap.
They also usually require ignition coils around that mileage.
Those old GM cars eventually reach a point where they become money pits, requiring 400 to a thousand or so every couple months.
Brake lines, cha-ching
Stearing rack, cha-ching
Window regulator and custom mount to replace rusted out one - cha-ching
When it gets to be a bi-monthley bill of what's next, it's time to dump it.