I'm at a complete loss with the 2000 Max. Car was running rough and check Engine light was on. I took it and had the codes scanned. Had O2 sensor and Misfire in Cyl 1. I replaced the O2 sensor and the codes for it went away.

In order to troubleshoot...I moved the coil from Cyl 1 to Cyl 5 and reset the Check Engine light. Bingo...light came on...car was running rough and this time it was misfire on cyl 5. So I replaced all the plugs (NGK's) and also replaced the Coil.

Still getting a misfire in Cyl 5. Any explanations as to what else would cause misfires? If it was an injector it wouldn't have moved from cyl 1 to cyl 5...or if it was the fuel rail or fuel filter I would have problems with random cyl's misfiring.

 

These guys wwere saying something about the MAF??? Check into that, they all said car was running rough too!