1998 Ford Crown Victoria shuddering

1998 FORD CROWN VICTORIA
10,000 MILES • V8 • 2WD • AUTOMATIC
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MRLLOYD00
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why do my 1998 ford crown victoria seems to shudder around 45-55 mph but when i accelerate it goes away?
Jul 17, 2010 at 9:44 PM
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RASMATAZ
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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.
Jul 17, 2010 at 9:53 PM