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2002 Ford Explorer Question: P0306 & P0316 code on '02 Explorer 4.0 SOHC

 

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fordgeek, 4.0L V6 SOHC, Peachtree City, GA, June 21, 2010, 10:22
 Rookie

I replaced all plugs and wires. I figured at 93k miles it was about due. I cleared the codes and drove for 3 days and codes and rough idle returned. It doesn't seem to have an obvious misfire until the code comes back.

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