Did some more tests. Any kind of electrical load like lights or turning on the car stereo will kill the engine at idle and the electrical goes totally dead. Un-hook the battery for a min and hook it back up. Car kicks over. No electrical problems when starting it up in the morning an can run anything and it won't kill the car. I noticed that after a long drive and at idle, the lights are a bit dimmer in the car which leads me to believe it's the alternator. Besides probably replacing this, any other suggestions what it might be?
Could the problem be the voltage regulator?