Check the battery.Believe me it could be all your problems.Mopars are funny weak or bad battery and they run bad.Wife ran the battery down in the Durango and when it started it ran terrible just like yours.After a good charge and it learned to run again it was finre,Ive seen tons of them do the same thing.Oh yeah dont say the battery is only X old dosent matter have it checked along with the charging system.That and make sure if it sits it is still charged up.Rocky