I am having the same problem with my 2010 Ford Focus it is currently at the dealership. A month ago I brought it in for the same issue and they said they could find nothing wrong. Yesterday while driving on the expressway my car went into limp mode and almost caused an accident. I dropped my car off last night and was told they couldn't look at it today, or provide me with a courtesy car. They also said if the computer doesn't show a code when they do look at it there is nothing they can do. I tried to mention that I read on several sights what the issue may be but as a layman I could tell they were not taking me seriously. If any of the Ford customer service people are on here I could use your help.