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It should be possible with most any car. I have a 05 nissan frontier (obviously fuel injected and computer controlled) and there is a weird turn key, press gas 10times, turn key, stomp on brake peddle a few times, etc etc and it resets the idle to stock.
I found my idle creeped up about 100rpm above stock.
Also, if you want it lower that stock (which will probably make the car vibrate) the dealer CAN do it, but unless you have an 'in' I doubt you will find one that WILL do it.
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