I'm currently having issues with my 2005 Ford Focus ZX4 S automatic. About a month ago, I noticed that my battery light on my dashboard came on. Within a few days, I felt the car slowly losing power and eventually once even shut off. I took it to a local mechanic and had it tested, for them to say that I had no issues, but my battery was testing on the lower side so they recommend that I replace it, which I did. However, a few days later my car started doing the same thing (losing power, battery light still on), so I returned to the mechanic where they ended up having to replace my alternator as well. Now, a few weeks later, my battery light still comes on and I still feel as if my car isn't using as much power as it should, especially when I'm idle or at a stop. The car even sputters sometimes and has an intention vibration whenever I'm sitting still (in park or in drive). PLEASE HELP.