I had started a group for the Mercury Owners that had cracked plastic intake manifolds on their 4.6L engines. There are class action suits in a few states so far, one attorney is taking it to a national level if possible.
So join up if you want more info or are interested in finding recourse for your woes. You need to have a yahoo profile. I screen all applicants to keep out potential Corporate Ford snoops.
http://finance.groups.yahoo.com/group/crackedmercs/