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Old 01-13-2018, 08:03 AM   #4
Charlie-III
NASIOC Supporter
 
Member#: 30669
Join Date: Dec 2002
Chapter/Region: Tri-State
Location: USA, North NJ, 07456
Vehicle:
1998 Legacy 2.5GT
Silver Sleeper BK, 5MT

Default

Could be the ECU relearning, you lose fine learning when clearing codes or removing power to the ECU like during a battery change.
This should not take long though, at most a few cold starts unless you have some mods or possibly failing/worn parts which may make it take longer.
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