The rear wheel drive Buick's (GMs) were good cars, easy to repair and used to be easy to find parts (ie door) for them.

The stalling problem is not likely major.   Maybe needs new plugs, (or wires, or air filter), or fuel injectors cleaned.


Maybe the heater problem is related to a stuck rad thermostat? Or, maybe it needs a rad flush and new coolant (or coolant is low)? Even if you need a new heater (which is unlikely) a used one could be easily found.