Why don't you try and adjust the RPM's a little bit higher like in 1500+, and monitor the A/F ratio to see if they stay the same or get better. Maybe when they tuned the ecu, they tuned @ 1k RPM or lower, richer, cuz when you were revving the car and it passes 1500RPM's the A/F's went to 12's and up, but @ iddle in 1k it got very rich.
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IG: chris___s14
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