05 magnum 5.7l has any one ran into a misfire problem under light accelaration any speed and heavy vibration
thanks keith

 

sounds like the MDS system kicking in. it shuts down 4 cylinders, giving a slight vibration and misfire feel.

 

i had similar problem, I imediately called the dealer, at first they couldnt figure out why it was doing it. they called chrysler and eventually they have to replace one bank of lifters on the MDS. I just had oil changed too, thinking maybe they had put wrong oil in car and this happened dont know for sure, but all is well now after replacement