I have a '99 Grand Marquis recently it started have problems at idle.
Sometimes it idles but it feels like it is idling below its normal idle
speed. When driving it doesn't have a problem at any speed, however,
occasionally when cornering it will die. The check engine light has not
come on (other than the normal times when starting or restarting). I had
the codes checked anyway and as I expected I set a code of P1507 because I
have been keeping my foot on the accelerator to keep it from dieing at
idle. Any suggestions would be greatly appreciated.
IT sounds like tha IAC is dirty. Many times they can be
cleaned and reinstalled after soaking in throttle body
cleaner for a while followed by a good spray dousing. While
you are at it, it would be a good idea to clean the MAF
sensor and the EGR ports in the manifold. The IAC will not
normally set a fault code just because it is dirty. It can
also cause hard cold starts and no high idle when cold as it
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