For the first time in over 13 years and 110,000 miles my '04 R/T gave me trouble. Suddenly, it refused to rev over 2300 rpm. After having it flatbedded home, I opened the hood and found the fault to be entirely my own for neglecting the battery connections. The positive connection sits under that plastic cover and I just hadn't looked under it for far too long. A quick cleaning of the terminals and clamps and she was fine again.