2005 Lincoln Aviator Q&A

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

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 -
Answer 1
DO YOU HAVE A CK ENG LIGHT ON? -
Answer 2
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. -