I have a question or two. if you hear a clicking noise around the valve cover on the top of your motor it's more than likely a bent one or not enough oil? I checked the oil and level was great i'm going to change the oil tomorrow because it is do. another question is how hard would it be to change the valves. I changed out a whole engine on my own with very little help with my brother. the hardest problem I had was getting the axles out and getting them back in. "nothing a "BIG HAMMER" won't take care of"
well it's probably not a bent valve as that tends to give off a cel with misfires as the code. It's possible it could be oil pressure and not a lack of oil so you might wanna look into that.
to change the valves you'll want to pull the engine out. It's the easiest and safest way. just remember to check your valve clearances after replacing them cause you may need to re-shim them for proper clearance.
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