Is it cylinder # 2 that is still misfiring? Did you replace the wires when you replaced the plugs? Ifnot, check that wire to be sure it isn't shorting through a crack in the insulation or something. As for the check engine light, that you need to find out why it is on. I am not that familiar with your enbgine so I have no idea as to what all it could be checking, but it could be anything from a bad sensor to something going wrong in the ignition circuit.
Some of the other guys that have those type cars and set ups will be able to help you I am sure.
Ron
