Q: Cold idle start

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I have a cold idol start every morning in my garage for about 20 to 30 seconds. When my Eddie Bauer is left out in the cold below 30° the cold idol start last a few minutes . I have been told it's a vacuum leak but I have searched everywhere and cannot find nor hear a vacuum leak. I have cleaned the butterfly and inspected all of the breather hose connections and electrical connections. I have also taken apart the MAF sensor and cleaned it also . Thanks I hope you can help DJ
My car has an automatic transmission.

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