2000 Mercury Villager Engine Roughness

2000 MERCURY VILLAGER
170,000 MILES • 6 CYL • 2WD • AUTOMATIC
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BILLY078
  • MEMBER
  • 1 POST
When accelerating engine is fine but cruising above 37 mph the engine is rough. I have replaced spark plugs ,cap, wires, 02 sensor and checked all hoses what should I do next? There is like a surge of roughness
Aug 16, 2010 at 11:45 AM
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RASMATAZ
  • ✓Experienced Mechanic
  • 75,988 POSTS
Engine running rough or misfiring can be cause by the following:

1.Defective spark plug
2.Inadequate spark/coil,defective spark plug wire.
3.Lack of compression
4.False air leakage.
5.Faulty fuel injectors.
6.Insufficient fuel pressure.
7.Contaminated fuel.
8.EGR valve that is leaking.
9.Oxygen sensors.
10.Throttle position sensor.
11.Idle air control valve.
Aug 16, 2010 at 2:05 PM
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