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I have a 2004 Cadillac CTS 3.6L and I noticed yesterday that it did not have the acceleration that it had and was sputtering through the RPM range and I was wondering if anyone could help me figure out what is going on. I took it to Advanced Auto and they hooked it to the computer and their computer pulled up two DTC codes. One for the P0430 which is the catalyst efficiency below threshhold (bank 2) and P0446 which is the EVAP emission control system vent circuit Malf. If you can help me figure out how to fix this it would be much appreciated. Thank you!!

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