code 13

  1. C

    Engine Code 13 and high idle

    Hey guys, I’ve been chasing a high idle issue on my 91 Mustang GT and could use some advice. I’m getting a Code 13, which I understand indicates my base idle is too high. Without the electrical harness plugged into the IAC, the idle sits around 750-800 RPM with the throttle stop screw fully...
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