I'm new to the Subaru world. I have a 04 WRX with a CAI, headers, castless downpipe, full exhaust, grimmspeed boost solenoid, and an open source tune. I just had it tuned a couple of days ago and about a day after, I got the p0171(system too lean-bank 1) code. I deleted the code and cleaned the maf. It's been almost a day now, and it hasn't come back on however when I'm at a stop my AF is reading like 16-17. It's fine when just cruising around 14.7 and 12 when I hit boost. I'm just wondering if anybody has any ideas? Thank you!