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

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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

(2) Answers
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.
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