that sure sounds a lot like the throttle body problems some folks were having. I'd have the code pulled at your local auto parts place if you don't have a code reader.
If it is related to the TB, I'd disconnect the negative terminal on the battery (to reset the ECU and to protect the throttle position sensor while you're manipulating the butterfly valve), then pull the air intake hose off in front of the throttle body, spray some throttle body cleaner on the plate and on a rag, wipe off the plate (front and back) and the bore. It takes some pressure to move the butterfly valve, but give it a good cleaning.
If you see a big ring of carbon buildup on the bore and the butterfly valve, that well could be the culprit.
So far, it seems if you have this issue and go to the dealer, along with a TB code, the immediate course of action is to replace the throttle body--particularly problematic since Ford won't have the available for quite some time.
No guarantees that it, but that's a semi-educated internet diagnosis.... | 
