Thompsonpride

I bought an rx 8 a month ago I was told it has a cold start but found out that's not the problem. It has a rough idle at a stop in gear. It goes away in park. I have pulled the codes p2096 running lean bank one and had that cleared and then codes p0300 random misfire. An 8 enthusiast said every 6000 miles you need to replace apex seals my car is at 11700 currently. Please help