Just from personal experince when a similar event happened with my 95 Contour SE it turned out to be the DPFE sensor, the code was a 327 and no signal was coming from the DPFE sensor. After checking around I found the part for $52 bucks at Autozone where they called it a EGR pressure sensor, the Ford part was running about $100 locally and the garage I took it to wanted $135 for it. The part is a bugger to get at and it sits on the drivers side of the engine block almost directly below the actual EGR Valve. The labor the garage was charging was about $100. I talked to a couple of Ford Techs and they said it was a pretty common part that needed replaced in all Fords. Hope this helps and good luck with it.
