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Old 11-16-2012, 09:24 AM   #8
treksofar
Scooby Newbie
 
Member#: 208070
Join Date: Apr 2009
Chapter/Region: NESIC
Location: West Boylston, MA
Vehicle:
2006 Impreza 2.5i
Regal Pearl Blue

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Another thing to check is to see if you have gunk built up around the butterfly valve in the throttle body. For a while, whenever I reset the ECU or did a battery pull the car would have issues returning to idle for a few days. If there's excess gunk in there the ECU needs more time to learn how much to crack open the valve for a smooth idle.
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