Question about 2001 Subaru Legacy

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I have a 2001 Subaru Legacy. It has been chugging at highway speeds and frome dead stops. I've changed the plugs and the motor seems to run fine except for a slight hesitation at idle. Once the car is revved up it smooths out and a few minutes later it will start again. It threw some codes such as the downstream O2 sensor and the knock sensor and the thermostat as well. I changed the thermostat and no are showing right now. The car still chugs though. Any Ideas?

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Check the fuel filters and fuel pump, could be 1 or both dirty, need to replace if so.

Posted on Feb 04, 2010

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Engine chugging


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