Hi everyone, I’m having an issue with my 2005 350Z (VQ35DE) and could use some advice. I’ve been getting P0300 misfire, P0171 (Bank 1 lean), and P0175 (Bank 2 rich) codes. Spark plugs have been replaced, and the misfire used to be intermittent but now comes back immediately after clearing the codes. While inspecting the engine, I noticed that the rear PCV valve and breather hose had completely come off and is cracked/damaged. I’m wondering if this could be causing unmetered air and the lean/rich codes, or if there might be other things I should check first. Any guidance or similar experiences would be appreciated — thanks!

If it isn't the hose what would be my next steps on thing to diagnos/ replace, cheers