Did you clean the EGR port area like this?

http://www.contour.org/ubbthreads/showthreaded.php?Cat=&Board=v6maint&Number=337774&fpart=&PHPSESSID=


The dealer did this on my sister's Duratec Mystique, also a 1995. Cost a bit, but could be done at home next time. Cleaning stopped the code.