Was the battery recently disconnected or run dead? Will the engine stay running if you hold the accelerator pedal down 1/4"? If it will not, unplug the brake light switch under the dash, If the stalling no longer occurs, the problem is likely related to the current the brake lights are drawing and a good place to start is with a charging system test. You can start that yourself with an inexpensive digital voltmeter. Measure the battery voltage with the engine running. You should find between 13.75 and 14.75 volts. If it is low, we'll need to check further for the cause. If it is okay, that only means it is okay to perform the second half of the test. That is "full-load output current" and "ripple" voltage. A professional load tester is needed for that.
If the charging system can't keep up with the little current brake lights draw, it won't keep up with the higher current the heater fan draws, and running that should also lead to stalling. Making these observations will tell us if there is an electrical problem or a vacuum-related problem.
Also observe if you get a nice strong "idle flare-up" to 1500 rpm for a couple of seconds when you start the engine.
Wednesday, November 30th, 2016 AT 5:09 PM