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11-04-2009
So I was just given an 03 Grand prix GT. Having some issues. Very poor gas mileage, won't go bast 4100 RPM, no power, no acceleration, and making a noise that seems like exhaust near the rear of the motor. Think it might be the cat but not sure. Any ideas? 3800 GT.
11-04-2009
Please do not triple post. It is most likely a clogged cat.
11-04-2009
I would agree it is likely the cat by your description. Good time to upgrade, get a new downpipe with or without cat.
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