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#3: 01-29-2013, 08:52 AM
 
 silbeej
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Location: Northern part of the Eastern United States
Car: 2009 Legacy SE 5MT DGM
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Have heard that sometimes a dirty mass airflow sensor can do that, happens as car gets older etc. Other than that maybe an ECU reset, if you can do that by removing the battery, could help but have not tried it. Hope this little advice helps but i'd read into that sensor, or if someone you know has a diagnostic device plug it in and see if any errors are showing up.