When your engine starts hesitating or the car stalls at stoplights, the fuel pump module is usually the culprit. It is a vital part that pushes gas to the engine, and when it fails, the car simply will not run.
You are looking at about $800 for the part and the labor. It is a necessary expense that usually hits when you least expect it, making it hard to pay for in one lump sum.
Remember that the 0% intro APR is a deadline, not a gift. If you still have a balance after 15 months, the bank will start charging interest on whatever remains, which gets expensive fast.