I have a 2000 xj and had the check engine light come on and the code was a misfire on cylinder 6. Replaced the plugs and the old one look like it could have been bad but it's still missing.

Also all the plugs looked like it was running really lean. Any ideas?

 

Make sure you have new spark plugs and a new coil pack. Like my 00 xj yours does not have a distributor. The coil pack is one big piece you need to replace it. Do both of those things you should be fine.

 

Will that also help with it running lean?

 

Yea if your running lean you might want to check 02 sensors (yours should have 4), fuel injectors. I really could be alot of things man. Im just trying to point you in the right direction. Definitely get a new coil pack and plugs. Good luck with it.