Question about 2002 Mercury Grand Marquis
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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Posted on Jan 02, 2017
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