This morning I went out and started my car as I doe very morning to let it warm up before leaving for work in the morning. It started up fine, with no hesitation.

When I came back 20 minutes later the car had shut itself off (I'm assuming stalled) and refused to start. It would crank over just fine, the battery seems to have plenty of juice, (lights all work, radio, locks, no dimming of lights when running anything), but it will NOT start.

What gives? Any ideas?