My neighbor's got a '98 Cherokee Sport 4.0. The check engine like popped on the other day so I pulled the code. The cause was cylynder 3 misfiring. I'm sure someone else on here has experienced this. Anyone have any points on diagnosing the problem? Thanks for the help!

 

First, I'd start from the distrib and see if you are getting spark all the wat down to the plug. More than likely, you'll find a bad plug wire or plug itself. As for cause, it will ddepend on what you find.