While on the idling condition, the car will stall but will continue to run when the gas pedal is depressed.
Car Problem Diagnosis
When carburetor engine stall while idling but will continue running if the gas pedal is depressed while the engine is about to stall, is an indication of a too low idle speed. All carburetors on a carburetor engine has an idle speed screw, this device set the idle speed of the engine to slow, normal, or fast idle. If the idle speed screw was set too low than normal the engine will stall. This is evident as the engine will continue to run when you step on the gas pedal, this will give the engine more gasoline to continue running.
Possible Cause of Stalling While Idling for Carburetor Engine
Idle speed is too low
How to Fix Carburetor Engine Stalling While Idling
To fixed the problem, the first thing to do is to set the idle speed screw higher, the next thing is to determine why the idle speed becomes low, if your car has been previously worked on, the mechanic might have set the idle speed low because usually speed idle screw don’t unscrew without having someone messed up with setting.