2003 Mercury Mountaineer • 6 cylinder AWD Automatic • 100,958 miles

My 2003 mercury all of a sudden started running very rough and has a sulfer smell and the check engine light came on. I bought a code reader but no codes are being displayed.
April 11, 2011.

1.Defective spark plugs
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.Manifold absolute pressure sensor
12.Mass Airflow Sensor
13.Idle air control valve

Note: If it doesn't apply disregard it-

Apr 11, 2011.