Got in my ranger the other day and noticed lack of engine power, as well as rough idle. Check engine light came on. Autozone diagnosed from the computer as cyclinder 3 misfire. I replaced all the spark plugs, cylinder 3's plug was pretty nasty looking, all others were fine. This didn't fix it. Next I replaced the ignition wire from the coil pack to the plug and that fixed it, for a few hours, then back to square one. Should I just keep moving up and replace the coil pack at this point? Thanks.