I have a 2001 Tribute LX V6 AWD with 122,000 miles on it. I bought it with 80,000 miles on it 3 years ago. 2-3 months ago was the first time it misfired. The throttle was very shaky, it had a hard time accelerating, and the check engine light started flashing. I immediately had the light checked at AutoZone and was given the above codes that say, "The PCM has determined that a misfire has occurred in cylinder #5...#6." The print-out from AutoZone says the possible causes are ignition system fault, vacuum leak, injector fault, and high or low fuel pressure. What's strange to me is that it runs perfectly fine 95% of the time and then misfires badly about twice a month. I replaced the DPFE sensor (a known problem on the Tribute and the source of a lot of problems) about a month ago hoping that was the cause, but it's happend twice since then. I'm wondering if I should replace the EGR valve as well. I checked the sparkplugs and ignition coils in the front three cylinders, and they all look good. I haven't tackled getting to the back three cylinders yet because I'll have to remove the intake manifold and possibly more to get to them. I have two big questions that would greatly help my troubleshooting of the problem. Could someone please tell me which cylinders are which, so I can locate cylinders 5 & 6? Also, what would I need to do to swap the ignition coil from one cylinder to another to see if that is the source of the problem? Thank you very much!