Checked my cel codes

[Metalshredder_25]

I haven't done any engine work yet and the gas mileage is actually still pretty good,when I stomp on it the exhaust looks dark grey.It's wierd because the car performs awesome untill about 3500 rpm then it's got nothing left I don't know if the knock sensor would do that but I'll have to look into that and mabey change my fuel filter unless anyone else has any sugestions.I would really like to get this problem fixed before the honda's find out and start picking on me .