2002 Jeep Liberty missfire on cylinder 3

A misfire can be caused by a number of things but we need to check and make sure you are getting spark on the plug. I would remove the plug and hold it against the block and crank the engine just to make sure you have spark.

https://www.2carpros.com/articles/engine-misfires-or-runs-rough

If you do then we need to check the compression on this cylinder to make sure we don't have a larger issue.

https://www.2carpros.com/articles/how-to-test-engine-compression

You need to have a minimum of 100 PSI as I attached the spec below. However, if you have 100 PSI and the other 5 cylinders are around 150, which is about normal for this engine, then we still have an issue even though it is above the minimum spec.

Please run through this and let us know what you find. Thanks