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Actually, the same trouble shooting guidelines can be applied to any modern engine. 1.When is the last time you had a tune-up done? On newer cars this usually just means plugs and wires.(replace only defective wires. $30.-$45. each) 2.A coil(s) on the verge of breakdown may be the culpit. 3.Low fuel pressure. Checked at the fuel rail and can be adjusted if the fuel pump is ok. 4.Dirty air management valve. This should be cleaned periodocally by a competent mechanic. 5.Faulty PCV valve 6.Vacuum leaks (nasty little buggars to find) 7.Loose or defective gas cap If all else fails, get an engine diagnosis done. This will check the electrical components and check for any trouble codes in the computer.

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17y ago
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Q: What can you do about a rough idle on a Mercury Villager?
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