My Buick Lesabre started then stalled will turn.

Go to this walk thru link: https://www.2carpros.com/articles/car-cranks-but-wont-start

Have a helper crank it, while you visually check for spark at the spark plugs. If you have spark everywhere, use a gage and check fuel pressure. Can you check for applicable trouble codes? You can check mil codes, yourself. To check for mil codes, use a jumper wire between A & B terminals at the datalink connector. Turn key just till the dash lites come on, no further. Then the mil on the dash starts flashing. You count the flashes to get the codes. Your looking for two digit codes.

Hi raz, have a good day.

Same to you my friend-Happy Holidays