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P0306 & P0316 code on '02 Explorer 4.0 SOHC

(2002 Ford Explorer)
in Peachtree City, GA on June 21, 2010
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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