Thread: 99 F150 Shuddering???
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  #4  
Old 05-30-2008, 06:26 PM
glc glc is offline
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Join Date: Dec 2006
Location: Joplin MO
Vehicle: 2003 Ford F150
Posts: 10,353
You sure it's not a low grade engine misfire? How old are the plugs and what kind are they? Have you ever changed any of the COP's?
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2003 F150XL 4.2 short cab/bed 4x2 5 speed manual 3.55 LS
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