I think it's the transmission.
The same week we took the car home, we noted (while driving) at times it would slam into gear, like being rear-ended. Took it back to the dealer, whom of course said they couldn't find anything wrong.
A couple of weeks later took it back to the dealer with the same complaint. They kept it over the weekend and said once again they couldn't find a thing wrong.
However, the slamming into gear stopped after the last trip to the dealer, but six months later and now out of warranty it has a new problem. At times it acts like it's in neutral while driving, and it's getting worse. No engine lights go on and no leakage in the garage. It is no small wonder Ford are having finance problems when they produce junk.
I had 2003 Windstar with similar issues. The only thing that fixed the issues was a remanufactured tranny from Ford. Then I got rid of it and got a Flex. Much better.
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