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  #1  
Old 12-20-2007, 01:58 PM
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cj
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Default misfiring

03 ranger misfiring.....changed fuel filter and sparkplug wires. do i have to take to a ford dealer to get accurate diagnostic test?
 
  #2  
Old 12-20-2007, 05:34 PM
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Default RE: misfiring

What do the spark plugs look like? Did you replace those too? What size engine?
 
  #3  
Old 12-21-2007, 07:31 PM
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Default RE: misfiring

Have you checked codes? How many miles on the truck? If over 100K you should change the plugs.
 
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