Mechanics

MY OS RUNNING VERY ROUGH WHAT COULD BE THE CAUSE

1999 Ford Expedition • 236,400 miles

Engine running very rough
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Dutchron
May 6, 2012.




Check for tune up, check fuel pressure check engine compression.

Spark plugs and coils are common to do this on this truck. If you have a scanner check codes see which cylinders are counting miss fires and swap coiles to see if the miss has moved
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Djcl
May 6, 2012.

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