Starts and stalls right away on 2000 Buick Regal. (Non-Turbo)?

Starts and stalls right away on 2000 Buick Regal. I owned this car for 5 years, this week, this problem started. When I start it, it will run normally the first time, then, if I shut off the engine and restart it, it will start and stall right away, cannot hold the idle at all. I got a new battery, and the fuel... show more Starts and stalls right away on 2000 Buick Regal. I owned this car for 5 years, this week, this problem started. When I start it, it will run normally the first time, then, if I shut off the engine and restart it, it will start and stall right away, cannot hold the idle at all. I got a new battery, and the fuel pump is pumping the fuel. So, what could be wrong? Thanks in advance.
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