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Q:

at stop sine it die's some time's but strats right back up on 1999 Buick LeSabre

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
some time 's then other time's runs good for day's
(2) Answers
Check for any codes, does your yellow service engine soon light ever come on? If so, get those codes!

here are some shops:

https://repairpal.com/directory?address=52653&car_brand_names=Buick
It could be your fuel filter is clogged, or maybe you need to replace the fuel pump. Get it tested, good luck