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I'd suspect a bad spark plug at first. Which could be the GAP setting is wrong or the plug itself is bad. There can be other more expensive issues going on, but I'd start cheap and work up.
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What if your 1999 grand marquis will not idle what is wrong?
check your air idle control valve
What is the firing order for a 1985 Mercury Marquis?
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Need to know what's wrong with it. More info please.
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