I have an 09 2.4 and it feels like it has lost power. It just seems like it doesn't accelerate as fast as it should. Also if you drive it hard it will sometimes feel like it is missing while sitting at a stoplight. I took it in to get looked at and they drive it around and ran test for a week. They did get it to feel like it was missing once, but they said everything was within manufactures specs. They said that the only thing that seemed a little off was that the Catalytic Converter was running a little hot. They said it was around 500. They said that a bad, or going bad Catalytic Converter could cause this, but they didn't want to replace it because it was expensive and they were not 100% sure. Does this seem like a correct diagnosis? Also, I looked up the Catalytic Converter and it looks like it just bolts on. Is it a bad install to do yourself?