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2016 Forester
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1,007 Posts
If you've done the obvious like checking tire pressures, and not driving over 70mph on the interstate, buy a bluetooth OBD reader and start troubleshooting. Take a look at your fuel trims and see if they're way rich. It is possible that your MAF sensor got dirty. Maybe your air filter is clogged. Maybe you have a clogged fuel injector.
 
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