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Also be sure to double check for vacuum leaks. I know you believe the car is running rich, but at this point we are just speculating based on the emissions test. I took my EGR plate off to clean the passages, and the car ran like crap afterwards. I tried everything I could think of, and then I traced down everything I touched when I clean the EGR ports.
The fuel injector seals were allowing extra air into the intake manifold, creating a lean condition. The seals looked fine, but sure enough a new set of seals solved my problem. Just something else to look into.
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