Idle racing after a IAC replacement. How do I slow this thing down to normal?
I replaced an IAC valve on a 97 Ford E-150 with a 4.6L v-8 due to it
making an annoying, loud humming noise. After replacing the valve on the
first attempt to start the engine the humming got worse and was constant.
I took the valve off again and then checked the gasket then reinstalled the
IAC. Started the engine again and this time there was no humming but the
engine was racing at idle. What can I do to stop this?