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Old 11-07-2020, 10:12 AM   #4
CaptainSlowbaru
Scooby Newbie
 
Member#: 445600
Join Date: Apr 2016
Chapter/Region: Tri-State
Location: Rafferty Subaru, PA
Vehicle:
2002 Outback Sport
Green

Default

You had a P0171, so I'd start with that. I know the light isn't on now, but you can have a lean condition that's enough to cause symptoms, but not enough to turn the CEL on.

A vacuum leak would cause a low idle for sure. If you have access to a scan tool that shows live data, you can check the fuel trims at idle- anything over 10% can cause symptoms. The code doesn't usually set until 18%-20% or so.
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