check engine

just changed my spark plugs to some PULSE PLUGS, and my check engine light is on. Is there something wrong with these plugs or did i do something wrong? all i did was replace them, no special instruction req? any advice? please help. Edub AKA Ebub

I developed a problem today. my engine light came on. I used my scan tool and it says that my truck is misfiring on #4 and #9 and due to that it's running rich. Solutions? I thought that 4 and 9 share a coil and it's fubar or the plug wires might be loose. what is the cylinder diagram or the...