Mitsubishi Repair: 2000 mitz galant, mitz, effeminacy

Question
i  have a 2000 mitz galant 4 cylinder
the check engine light came on
the codes showed misfire on cylinder 4 ( replaced plugs )
and catalytic  effeminacy below threshold
the car will not start if it is warm if you wait an hour or 2 it will start fine any ideas
or will the 02 sensor cause this

Answer
Devin: Sounds like another sensor to me. I would try the 02 sensor. I will try to answer this better at a later date, I am right now at my son's and need to check my books. I shall get back to you, but mean while I would replace the 02 sensor and see how that helps. Hope this helps and good luck!