2000 Chevy Malibu car dying while driving

We need to try to narrow it down. When the stalled conditiion exists, are you losing spark, fuel or both. Any number of things can cause your problem. Does the car start right up again, or do you have to wait and how long?

Sounds like your "idle speed control" is malfunctioning. Do you get a check engine light at any time while driving?

No. The idle ISC won't make it stall going down the road. Back to square one, spark or fuel. This is one of those situations where I wish I could drive the car for a while. My next suspect is the fuel pump. These fuel pumps usually work or they don't. All of the cases of a pump being intermitent over the years, I can count on one hand. The only to test my theory is to connect a remote pressure gauge long enough to be monitored from inside the car and watching for a pressure drop when the engine stalls. Most repair shops won't have this equipment. "OR" change the pump.

The gauge is a good idea. If you want to carry it one step further you could hookup a timing light also, tie the trigger and extend that into the car and monitor spark at the same time. The ign. Switch just feeds 12 volts to the coil which is grounded by the ECM. Most computer systems ground the various components rather than feed power. It's backwards of what you would think but, that's how the work. And yes, we get a lot of stalling problems on GM vehicles.