I've got a '99 Ranger 4x4 with the 4.0L V6. Sunday it started idling kinda or rough (almost dieseling) and had some hesitation in acceleration. Just a little after that started, the Check Engine light came on so I took it to Autozone to pull the codes. Computer says it's missing on cylinder 5. I had this problem not long ago with cylinder 4 so I replaced the plug and wire (I'd done them all at about 70k, truck now has 107k) and it didn't help at all. back to Autozone, same error (after running it a while to see if it would clear) so I replace the coil pack, still no joy. I don't know what to try now. Anybody got any suggestions? Thanks!