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Old 10-06-2018, 12:55 PM   #10
extrashaky
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Join Date: Mar 2014
Drives: 2014 BRZ Limited
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It's normal.

How old is your battery? I ask because my rough idle smoothed out some when I replaced the garbage OEM battery. Mine used to stumble when I turned the headlights on, and the rough idle with A/C blowing was more pronounced when the lights were also on. After replacing the stock battery with an AGM, the extra stumble from putting a load on the alternator disappeared immediately.
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