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When cold will not idle - back fires

(1999 Pontiac Montana)
in Atlanta, GA on April 11, 2011
When I try to warm up the van first thing in the morning, it will not idle to get warm. Once it gets warm, it runs find.
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of North Fulton Auto Center on April 11, 2011
Sound like it is too lean, maybe a temperature sensor for the fuel computer or an air hose disconnected?
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