why does engine die at an idle

maybe throttle body dirty or ignition sensor at the crank or cam

Is the check engine light on while running?? IF it is , that may give a clue , if you have the codes read and post them (before buying wrong/unnecessary parts).

When I had unhooked my battery to clean the terminals it did this when A/C was on. Fine other wise. Had to clean throttle bottle to get it to work again. There are utube videos to show. Been fine ever since.