Some of you wonderful mechanics on this website may have read my previous posts. I have an update on a problem with my 2002 Taurus 24v Duratec. I took it over to the ford dealer and they read the codes: 0305 and 0316. They estimated repair costs around $3600. I get a flashing CEL at stop lights if I idle for more than 5 seconds. However, I discovered that when I reset the computer or un-plug the battery for a few minutes and then plug it back in the problem disappears for weeks or sometimes months at a time. Any ideas of what this could be? Is it as serious as the dealer is making it out to be? Also, it doesn't help that most mechanic garages around here (not dealerships) refuse to work on this particular engine. Any ideas why?