My 99 ford expedition 5.4L is miss firing. I have done my research and understand the process in changing the spark plugs. I don't believe that it is the coil packs because my service engine light has not come on and there are no codes thrown. I have been warned that I can brake the plugs off and would need an extraction tool to remove them, is this true? Or is it that its more problematic to strip the aluminum heads by over tighting them or cross threading them. Thank you for your help.
Tuesday, March 12th, 2013 AT 9:46 PM