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My Aviator run differently depending on the temperature outside. Shifting issue on 2005 Lincoln Aviator

I own a 2005 Aviator. I am hoping that someone can help me identify an issue I am having. My Aviator runs wonderful if the temperature outside is 60 degress or below. If the temp is over 65 degrees the vehicle tends to sound like it is in a vacuum mode and won't accelerate or shift properly. It will also suck all of my gas when it is over 65 degrees. Please help me to identify the issue. Thanks

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1 more answer
What temp is the thermostat set to open at? Their are a few options,maybe a cooler thermostat, or possibly hotter, depending on which thermostat you have.