So last night on my way to work I got 4 codes!! P0069, P0300, P0420, P0228. So today in this heat I decided to pull the plugs and check them and guess what I found, cylinders 1-3-5 plugs looked like the iridium tips had melted!! So I replaced the plugs with my spare BRISK plugs and she runs strong now!! Now my problem is passing emissions I think the high flow cat (magnaflow) is scrap for passing, so now I have to replace the 3" with the stock dp then hope it passes!!