Replace it pronto!

Did so on my daughter's 98 Mustang (4.6 EFI). Wobbly at first then, noisy.

I took the serpentine belt off and tried each pulley to see which one was seizing...got to the harmonic balancer and it fell off on my hand!

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2009 ML350 (106K) - Family vehicle
2001 CLK430 Cabriolet (80K) - Wife's car
2005 BMW 645CI (138K) - My daily driver
2016 Mustang (32K) - Daughter's car