'99 Legacy sed. -- bought another Mass Airflow Sensor (WTF !)

Are you running a non factory oiled air filter system. If so you maybe
getting it fouled with oil or are you using throttle body cleaner and
soaking the MAS?
 
Nope. I'm NOT using a K&N filter or anything other than the factory
dry filters in my Subaru (but I never thought of that issue before --
something to think about when I re-oil the filter in my Corvette).

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