Thank you for the information. I did change out the wires at the same time. I purchased them from O'Riellys. I have just ordered a scanner interface that will allow me to use my laptop to read and reset codes. I will change out the spark plugs with the OEM AC DELCO and remove the EGR and give it the once over. Is there anyway that the EGR being stuck open would cause the misfiring problem? Or am I looking at two different problems.