For my problem, the shuttering and hesitation and problems, but they can wait... I'm more concerned with this whining noise its making. I just want to make sure that it's not going to cause major problems later on. They shuttering/hesitation in my situation is probably related to what other problem(s) I'm having.
I've test drove 5 Focuses before buying this one, and they all ran fine, and I didn't hear the noise I hear in my car.