Q: My car wont get up pst 25-30 mph

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To start with the car belongs to my girlfriend. Its a 2002 pontiac grand prix. I never noticed a decrease in cars power output until she warned me. To me it sounds like the car may be clogged up so I was thinking possible catalytic converter, 02 sensor, or mass air flow. Could it be? I know her uncle had the car previously and he was the 2nd owner and drove the car everywhere.
My car has an automatic transmission.

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