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

What is your question?

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