Are you referring to the IAC valve or the INTAKE AIR SENSOR, an EGR problem, an Engine coolant temp sensor, or what ?.
Are you referring to the IAC valve or the INTAKE AIR SENSOR, an EGR problem, an Engine coolant temp sensor, or what ?. Plugs can be BLACK due to excessive fuel pressure, MAP sensor, restricted air cleaner and numerous sensors or even the computer itself. You need to get a professional diagnosis using the appropriate equipment in order to diagnose your problem.
