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lean idle

  1. Lean at idle

    GT/GTS
    What can cause lean condition only at idle? any help pls? the car has SDS stage1, blackbox, and ripp headers. Tried to change the fuel pressure around 45-50 psi, no difference. Took the car cruising, feels ok, A/F bouncing lean-rich. Stop and idle, A/F stay lean. :confused:
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