I have the same problem with my ripp on my 2013 2 door manual. It doesnt want to accelerate smoothly when the engine is cold or below 160 degrees on my Scan gauge. Also the highway problem your referring to when you press the pedal a hair to speed up and it dies for a second then picks up. My jk has the same issue and when it happens my air fuel gauge will go to 15.7 or more on the lean scale then quickly richen up. I believe it's the ecu trying to stay in "Eco" mode or the aftermarket map sensor is delayed trying to read positive manifold pressure beyond the factory calibrations