'92 Vert dying at stoplights

[240trainee]

Ok, here's the car

92 vert
automatic
bone stock

My Mom has been driving my second car (this one) for a couple months now. It seems that at stoplights, the thing will die and not start again. Now, she says there is nothing out of the ordinary, one moment it is running, the next it's not. The motor turns over, but won't fire. But after a couple minutes it fires right up.

Now, I drove the thing for a couple months before her, never had a problem. I have drive it around since then, and it has never happened to me. I replaced the starter last week, but that was a different issue, wouldn't crank until I hit the starter with a hammer.

The problem here is it cranking but not firing, and dying at stop lights.

I don't know what the fuck it is, and I can't get it to happen to me. but it kinda needs to stop.

any thoughts??