My engine dies as soon as I turn on the air conditioning.
Engines have sensors that are used to give feedback to the computer about what is happening. If one is not working then the computer doesn't really know what to do. In your case, the air conditioning has pressure sensors that let the computer know that you have turned the air conditioning on. The computer will then respond by kicking up the idle speed of the engine some to compensate for the extra load. The same thing happens when you turn your steering wheel all the way, the computer kicks up the idle to deal with the extra load on the engine. I suggest seeking the help of a professional mechanic, such as one from YourMechanic, to help you properly diagnose your car's stalling issue. The mechanic will have access to the wiring diagrams and diagnostic information needed to determine which sensor is faulty.
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