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Rudy - Have you recently started driving with the air conditioning on? I have the same ride as you and have noticed slight RPM fluctuations when the compressor is active (A/C on). Every car I've owned has slight RPM variations with A/C on though, makes sense with the added load of the refridgeration cycle, but I digress. Most of the fluctuations I've noticed have been at idle, I have not noticed anything while sustaining constant RPM between the 1500 and 2000 range, but also really haven't been looking for it. Also, is your engine warmed up to typical operating temperature when you notice this or does it occur after cold start? Just want to figure out your conditions so I can try and duplicate later on tonight!
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