Having issue with 2010 sebring 2.4L engine noise and vibration. It is a knocking vibration more prevelant when the car is in gear and the ac is on. Took it into shop and they said it was the ac compressor and they changed it out. Still making the noise, then they said it was the automatic tensioner, so I chainged that out along with the serpentine belt. Problem still there. Shop says it is still the tensioner because it has vibration in it. Any Ideas. I am tapped out on money to the repair shop and they are no help.