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Old 01-21-2013, 08:51 AM   #4
Leafy
Scooby Specialist
 
Member#: 330625
Join Date: Aug 2012
Chapter/Region: NESIC
Location: MA
Vehicle:
2006 WRX
WRB

Default

Oscillating idle afr is normal. It'll also do it in cruise. This is how closed loop systems work. But it shouldnt mess up your idle. I would just check for vac leaks and post maf leaks before going back and making your tuner fix it.
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