Sounds like it just stalled. As the car is stalling you'll lose the power steering and vacuum assist to the power brakes. Is the chip in your car a custom tune or is it the off the shelf one?
Were you coming to a hard stop while turning into your driveway by any chance? When we got our first SN95, that happened a couple of times. Hard acceleration to sudden hard stop would cause it to stumble and die every now and then. It only happened after first getting the car though, once it had over 5000 miles, it never happened again.
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