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It could be as simple as dirty spark plugs. I would pull one of the plugs and check their color. If black it could mean misfire or too rich fuel mixture probably from a dirty air filter. If they look ok then disconnect the O2 sensor on the exhaust and see if runs better. You might want to drop by the Auto zone and have them do a reading on your cars computer for free. they will give you the error code that are causing the light to go on.

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Q: 1999 Mercury Villager yellow Service Engine light engine runs real rough no smoke. What could it be?
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