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


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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treksofar is offline   Reply With Quote