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I have had similar problems. I would try replacing the air charge temperature sensor. If you still have trouble, try heating the sensor by taping it to a radiator or heater hose. If this fixes the problem, heated air from the shroud around the exhaust manifold is not reaching the air cleaner, causing the sensor to read to cold of a temperature and making the engine run too rich. Hope this helps.
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Why would a 1993 Ford Taurus engine stall when the weather is humid and hot?
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