u/AcceptableSimulacrum

My 1988 Lincoln Town Car is stalling when parking on hills. No other issues w/ the car. Runs like a dream generally speaking. I'm trying to figure out the smartest way to narrow down what the problem is without wasting a bunch of money. Appreciate any advice. So far I've read that it could be:

1. Fuel pump
2. Fuel filter
3. Idle air control valve
4. Throttle body
5. Map Sensor/Map Sensor Line