Changed out the spark plugs on the Jeep. The ones that were in it were looked like they'd been pretty hot (white) and were gapped at .07 when they should've been at .04.. Fixed the rough idle, hopefully it helps mpg a bit as well. Can't get the dang back door rattles to stop after the amp install. Leaving for my road trip tomorrow and I imagine I'll be driving most of the time so the rattles won't bother me as much as they will my passengers