So after all this time, this topic may still bring up some questions even if it does not directly apply to the lope. Tonight I spent some time again looking over the cam profile of the 3.6 Pentastar engine and one thing I did notice; even though the tune is for a Challenger, it has the same profile as a FWD vehicle between 1696rpm- about 4500rpm. As mentioned before, the midrange is choked and more than likely its due to emissions. Now from 864rpm-1152rpm the cam is set for a 108.5 LSA and from 1312rpm to about 4352rpm the LSA drops then comes back up. This is obviously for emissions as the average user operated under these engine rpm's. At 512rpm the LSA is set for 122.5, at 6816rpm its set for 112.5....
I've looked at many dyno results of the stock 3.6 and just about every one in the midrange has the intake centerline drop in the midrange then come back up which would explain the fluctuating Torque in the midrange, yet provides a steady HP increase.
Anyways, back to the idle....
Apparently with the 3.6 engine a 108.5 LSA is considered a tight LSA but with the 3.6 its not tight enough to create a lope....