Question about 1999 Mercury Grand Marquis

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Rough idle Intermitantly when the car is started, it idles exteamly rough and eventually smoothes out after temperature is warm. Other times it starts normal and has a smooth idle. 1999 wit only 12,700 mi. Thanks!!

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  • Anonymous Mar 22, 2014

    Idles rough and dies when idling

  • Anonymous Mar 23, 2014

    If I put the car in neutral the car smooths out. On hill climbs it smooths out if I downshift.

  • Anonymous Mar 25, 2014

    Problem started after distributer replaced following burning out and failure of old one

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Have this car taken to an auto repair and ask for a engine oil flush and engine oil change, that mught help

Posted on May 28, 2008

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2005 Ford five hundred sel starts up runs nice and smooth when it warms up starts to have a weird idle like there is a cam loop but never dies drives down the road smooth


How long since a tuneup? Any applicable trouble codes?
The generic info for rough idle on any vehicle is to check for a leak of some kind, fuel--egr--vacuum, something of that nature.

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99 ford ranger, idles rough till it warms up,then runs good. Hard to start after it gets hot, it acts as if it is starved for fuel. Once it does crank it runs fine.


First thought: Check the idle air control valve, or whatever its Ford equivalent is. Sometimes these start to stick and cause the rough early idle that smooths out later.

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Hard starting, rough idle when cold, then smooth running when warm


Need year/make/model/mileage of vehicle to provide a more specific set of troubleshooting steps.

When was the last tune up? Hard starts when cold are usually caused by fouled spark plugs, worn plug wires, or weak ignition coils. Fuel systems are not as effected by temperature changes as the ignition components.

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1997 escort idles rough, the first thing is to make sure the throtlebody plate is clean. This sounds like the idle may be staying to low at times if it smooths out with ac on, when the ac is turnned on the computer raises the idle a touch to make up for the strain on the engine from the ac compressor, clean throtlebody and look at and clean idle air control valve, if this valve is not controlling the idle when needed the engine will idle lower than normal and cause a rough idle.
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