This may not apply to your car. But my wife's 2003 Impala suddenly crapped out under similar circumstances yesterday afternoon.
It would restart, but then would run roughly for just a couple seconds before quitting again. The "check engine" light did not come on. And sticking an OBD scanner on it showed NO active (nor pending) trouble codes. WTF???
A quick online search suggested a failed mass air flow sensor. The test/temporary fix is to simply remove the connector from the MAF sensor. When I did that the car started and actually ran pretty well. But now the "check engine" light was now lit and the OBD scanner showed a MAF sensor fault code - expected due to the disconnected wiring.
This morning replacing the old MAF sensor with a new one has the car once again running fine. The upside is R&R-ing the MAF sensor is about a 2 minute job. The downside is the new sensor cost me about $130. But my wife is once again happy.
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