Wednesday, March 11th, 2015 AT 6:23 PM
Over the course of the past month my car has been been surging on the freeway, when giving it gas it idled high. If driven for a longer period of time. Periodically it has jerked and idled low as if it were going to die. Recently I have seen black smoke coming from the back of the engine compartment which smells burnt.I see the black smoke after shutting off the car after driving and it's not a lot of smoke, but nevertheless it is smoking. The oil isn't contaminated and no overheating as of yet. Today Cel came on showing a code P0420. Any thoughts?