Have a 2000 Focus 2.0 - Just cleaned the valve but it wasn't dirty. Some varnish and some carbon in the tunnel where the spring goes. It's drying, but now thinking that the electrical component might be bad. If I need a new IAC, what is a reliable part? Amazon has a Walker for $55.95, which is much lower in price than those in the $143 - $175 range (original Ford parts).