Take it to the dealer. They will either reflash the computer or replace the precats.

Hopefully, you are still in the 8/80 warranty. Lou Fusz out in the Chesterfield valley had a mechanic name Kevin (friend of a niece) who did ours about a year or two ago.

Steve

98 Contour SE Sport 2.5 Duratec ATX The wifey's car 89 Taurus SHO - 246K miles 94 SHO ATX - 190K 1997 F-150 5.4L ATX - The Workhorse 150K. ANY THREAD WITH "OMG" or "WTF" ETC IN THE TITLE WILL BE IGNORED!