most mondeo's of this year have this problem 1.8 and 2.0 i work for ford and have run a 02 1.8 which did the same it would appear that the more miles that they have done the worse they are first place to check is your cat is it getting blocked put your hand over tail pipe with a glove on with someone revving the engine for you should blow your hand away if all is ok
old x19
April 2008