I have have an 04 ranger with the 4.0 v6. The hormonic balancer went out while my mother in law was driving it. She continued to drive it the 5 miles back to my house. So I replaced the balancer. Then it shows misfire cylinder 2&6 and a random misfire so I replaced the position sensor with a motorcraft sensor. Still threw the same codes so I changed the coil pack, plugs and plug wires. Still threw the codes again after 30 miles or so, don't know what to do next.

 

Have your mother in law buy you a new vehicle. FTW. Did you replace the cam shaft position sensor or the crank position sensor?

 

Crank position sensor

 

Check the connector itself and look at the cam shaft position sensor that also could be bad.

 

Now it is down to just a cylinder 6 miss fire wtf.

 

My 3.0 did the same thing and it ended up being that the spark plug on number 6 came loose but only misfired on the highway