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Sounds like fuel pump to me.
The coil may be bad as well. Coils generally are hard start culprits...especially in damp weather.
Voltage regulator? Doubt it. It's failure would cause all sorts of irregular electrical issues at once, not just stalling or hard starts.
But a general diagnosis is needed here.
The fuel pump is electric, and it should "hiss" when operating normally. A "buzzing" sound from the pump indicates a problem, or impending doom.
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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
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