2004 grand marquis idles up and down on it's own when i come to a stop

Asked by Robert Mar 30, 2017 at 11:02 PM about the 2004 Mercury Grand Marquis GS

Question type: Maintenance & Repair

any ideas on what it can be or what i can check or test ?

6 Answers
103,115

KenF answered 7 years ago

Probably responding to unmetered air, check for vacuum leaks, PCV valve/elbow is a good place to start.

Mark helpful

Guru5DNYQ answered 6 years ago

Throttle position sensor TPS and bad gas prob fuel filter especially if u dont keep alot gas In it gas sucks bad these days

Mark helpful

Guru9KQ9JN answered 2 years ago

prolly the titanium turbine took a shot of 91% peroxide/hmx. try adding air to the speedometer and accelerate to 88mph. that should tell us all we need to know.

Mark helpful

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