Sorry to hear that. But I think you should take your car back to the dealer and tell them to fix the engine since you are still under warrenty. Whether they will do it or not, that's another issue. If you take it to them, at least you will get a 50/50 chance. If you so worry about it and ends up not taking it to them, you pay everything out of your pocket. You do the math.
Just my 2 cents. Good Luck.
Just my 2 cents. Good Luck.