2004 grand marquis idles up and down on it's own when i come to a stop
Probably responding to unmetered air, check for vacuum leaks, PCV valve/elbow is a good place to start.
thanks i'm gonna take a look at that
Throttle position sensor and or bad gas and fuel filter just my opinion
Throttle position sensor TPS and bad gas prob fuel filter especially if u dont keep alot gas In it gas sucks bad these days
Looking for a Used Grand Marquis in your area?
CarGurus has 9 nationwide Grand Marquis listings and the tools to find you a great deal.
Search Mercury Grand Marquis Questions
Mercury Grand Marquis Experts
Related Models For Sale