Join Date: Aug 2008
Location: Lowell NC
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your issues are involved with the tuning
In Nov 2018, I installed a Modern Muscle NSR cam into a friend's '15 SRT 392 (M6).
It wouldn't idle w/o holding the throttle; if this was an automatic it would not have been drivable to get to the tuner for them to work on it. With this M6 / 392, if you didn't the engine idle would drop and stall - every time with the tune that was on it. (car already had LT headers and high flow cats with tuning for that)
One odd thing I found was with the throttle body connector disconnected, the engine would idle at 1,500 and still had throttle response!
The shop spend the better part of the week tuning it; the NSR cam has a very choppy idle, so it requires tuning to make it all work.
2016 392 Hemi Scat Pack Shaker 23Y pkg (M6) ordered 8/28/15, born 10/23/15, home 11/20/15
Torred / Black/ Ruby Red leather
2009 R/T 27J pkg (M6) ordered 7/17/08, born 10/23/08, home 11/13/08
Hemi Orange / Dark Slate/Light Slate Gray leather