could be some kind of short in the fan resistors or somethin, or could be bad alternator, but then i would think that the radiator fan would cause it to die as well, and you'd also have a dying battery
how about you disconnect the grounds to your stereo and see if it still stalls.
if it does still persist to stall, check the altornator.
if it runs great, then you should get a larger amp alternator.
i know NAPA AUTO sells rebuilt ones that have a higher amp rating, and 5 year warranties.
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