I have a 2000 honda accord v6 3.0 sedan. I was having a fluctuation idle in the park position after running errands for the day. After idle air control valve; idle air control system; & a random misfire in random cylinders, I replaced all spark plugs & replaced Idle air control valve. I no longer get the random misfires but I still have the fluctuation at idle in park jumping from 1500-1000; along with the idle air control valve; idle air control system. PO 505 code with CEL on.