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it will probably also die if you turn on the A/C, because the connection here is probably the A/C compressor. See if that is the case, and you may your answer. It may be that the A/C compressor is locking up or dragging, or your idle is too low to handle the extra load of the compressor.

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Q: What causes a 1991 ford F-150 with a 302 engine to die while idling when you turn on the defroster?
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