It may not be the alternator causing the vibration - it could be something else being driven by that belt. I would take off the belt and check the idler pulley first, then the rest to see if there is a misaligned pulley or one of them is very rough or loose when being manually turned.
SOURCE: vibration when idling in drive
check your pulley's. Sounds like one of them are bad and causing movement which where the vibrations coming from. A friend of mine had the same problem, his was the fan pulley. It could be moved inward and outward a little but enough to cause the engine to vibrate. The bearings were going out. check it out and let us know what you come up with.
SOURCE: vibration and allignment
have the front end checked for worn parts, something is worn out, hard to say without hands on look at the parts, any tire shop like Big O will do an inspection for free.
SOURCE: I believe my abs speed sensor is bad... WHEN I
If you hear a hiss it could be brake booster..
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