Fluttering Noise- pulley?
My '05 focus has 163k on it and the serpentine belt was replaced less than 10k miles ago. Of late there has been a fluttering/squeaking noise when I accelerate and it tends to be worse at lower RPMs. Once I'm in 5th I don't notice it too much. The noise also seems to be louder when the A/C is on and it makes a knocking/grinding sound when the A/C is first put on. Any ideas? Could it be as simple as the tensioner pulley? This last oil change the car also used a little bit of oil which has never happened before, not sure if there is a connection.