I have a '96 Disco SD, 4.0L. I am getting a missfire on the 6th cylinder and and random missfire code, P1316. Have replaced spark plugs and wires and nothing changed. Any ideas on what else I can do to solve the problem? Any and all help would be greatly appreciatted!

Thank you

 

What plug wires did you use?
Have you checked for excessive sludge build up?

 

I used the cheapest wires from NAPA

 

You need to use better plug wires, these things are super picky, I tried using cheap plug wires and had to replace them every 2 weeks.
Magnecore, STI or Kingsbourne plug wires.

 

I will try to get better wires and see if that helps. Not even sure if its the wires though, because I have scanned the check engine and one time I got the 3rd cylinder misfirig, after a couple days it was the 6th and now its the 4th one. Also got a random misfire going on.

 

I used a set of cheap ones and they were bad out of the box, that was before I knew better.

 

I just put in $80 dollar bosch wires I got from Napa and no change.
>

 

Have you checked the crank sensor and what plugs did you use?

 

SUCCESS! It was the spark plugs. Put in BOSCH Platinum Plus 4 plugs.
RUNS LIKE A CHARM

 

You probably had your spark plugs gapped wrong, you cant gap those snake oil +4's, but its running so go with it.