I purchased a 2014 Challenger Sxt 3.6 about a week ago. For the first two days it ran like a dream. The third day it started to have an rpm fluctuation 50-100rpm i would say. And it would have a hard start on cold. With a little more driving the car has been doing it intermittently. It has started shifting rough as well but that only started today. It has 91k miles on it. The car was a repo so i dont have a fob for it yet. Just a standard key with a chip. No unlock or lock buttons. All fluids look good as well. I disconnected the battery to reset it. But nothing has come up. I ran a diagnostic and no check engine lights have appeared. Could this have something to do with the key not programmed properly? Maybe the ecu pcm needs flashed? Or does it sound like a transmission problem. Also when i plug my phone in above the aux it wont charge and it did when i first got it. but it will charge off and on when plugged in under arm rest. Would a correctly programmed fob key help? This year had a ecu/pcm recall. But they "claim" my vin isnt included. What are the next steps to check and take? I checked fuses 5 and 6 and they are a ok. Wouldnt a faulty sensor or ecu throw a code? Thank you for your help. I have a road trip in a few days and need to get this worked out. Thank you.