2002 GMC Envoy XL dies with A/C or Heater on. What's the deal?

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I have a 2002 GMC Envoy XL with the Vortec 6 cylinder. About a month or so ago, our battery went bad and had to get a new one. After putting the new battery in, it would stall out and die when idling with the A/C or heater going. If we were moving along it was fine, but the second we would stop it would die. It runs just fine without the A/C or heater on; idling or driving.

At first I thought the alternator was bad so I have replaced that and it is still doing it. Does anyone have any ideas?
 
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