I changed my plugs used ACdelco irridiums. As soon as I started it up I had misfire issues and my engine light was blinking. Since then I have gotten a code for misfire on #6. I reset the comp by removing the Neg. Terminal and swapped the #6 coil with #2. I have not gotten another code but I feel ot runs rough, misfires and nearly dies at idle. I changed the oil pressure switch and fuel filter. Done the seafoam and cleaned throttle body front and back side. Any advise would be greatly appreciated!