hey so i had a bad bearing in my old alternator so i got a used one and swapped that in so when i jump started the car and the battery was low can a low battery cause the engine to misfire at around 900rpm becuase their is not enough power to the spark plugs engine ran perfectly before. this just started after i replaced the alternator now when the engine is at idle it will make a little bump sound randomly at idle weird thing is im not getting any codes so ideas do i just need to charge the battery ?