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Car so nice, bought twice
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Any electrical load you add will cause the engine to idle slightly higher, hence reducing vibration. Also when the engine is cold it'll idle higher to get the cats up to temperature (for emissions).

Neutral, for the "old" AT was 800-850 RPM. D, with no accessories, can drop to 650 RPM and you get some pretty annoying vibrations. Turn on the fan or whatever and the idle goes just high enough to make vibrations less.
 
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