Question about 2002 Mercury Grand Marquis

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02 grand marquis service engine lamp on, and idles a little rough

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Your best bet would be to take it to Auto-Zone and have them read the code/s for you. It is a free service and can help lead you in the right direction. You can look at your gas cap, it can cause a rough idle and turn cause an engine code. Let me know how you make out.

Posted on May 03, 2010

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Hi I have a 99 grand marquis .and it has a rough idle and it's hessitant when I accelerate .can someone please help.


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