I say alternator. If it occasionally not working then it could have easliy based a test when you had it in. YOu said you recently replaced the battery. So I am definitely saying it is electrical. I think a fuel problem would set off a check engine light and would necessarrly shut the car off.
Better take it in before the beast dies and strands you somewhere.
Final* Word on Game Delays:
The game will not be any better or include more content then planned. Any commnets that say so are just PR hogwash to make you feel better for having to wait.
Delays are due to lack of proper resources, skill, or adequate planning by the developer.
Do be thankful that they have enough respect for you to delay the game and maintain its intended level of quality.
*naznatips is exempt
