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Another tip, seems to work on my ZL1. If I start it and it's doing it's "cold start" cycle which I believe is just to increase temp as quickly as possible and warm up the o2 sensors, if you quickly start it and put it in drive, it goes right into regular idle. Put it back in neutral/park in the next minute though and it'll idle back up again. So get in start it in stealth mode (Either leave it in this mode when you shut it off or turn the ignition on and do it before starting), put it in drive, open garage, and leave.
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