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2006 Ford Fusion Question: Rough shifting occurred then emissions light came on

 

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arwolt, 2.3L 4 Cylinder, Concord, NC, December 23, 2011, 15:22
 Rookie

Today I was driving in traffic and I noticed the car was shifting rough. I then noticed the emissions light was on. The rough shifting continued for a bit but then was followed by unusually smooth shifting. This occurred previously and was supposedly corrected by replacing the intake manifold gasket, pcv valve, and O-rings which were causing a vacuum leak. Unfortunately it is doing it again. What might be wrong?

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