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My 1991 Plymouth Acclaim starts to lose acceleration after driving on the freeway for 20+ minutes. Sputters along and slows even if I floor it. Replaced fuel filter and got a tune-up. Any ideas?


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Sounds like you might have a bad 02 sensor. A pretty common problem on this vehicle.
1. Monitor the O2 (Oxygen) sensor voltage while driving, look for the sensor to "lock" or quit switching intermittently. When it "locks" it will sometimes "lock" at 0.5 volts or above. When this happens, the PCM (Powertrain Control Module) will pull away fuel to the point of causing a hesitation and lack of power. The O2 sensor will then start switching and the symptoms may disappear. Replace the O2 sensor.


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