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Q:

it feels excatly like i have a flat tire,but when i pull over and check all the on 2002 Buick Century

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
and appears no belt is broken
(2) Answers
it may be a shifted belt in a tire. get it checked asap as it may fail completely.

Roy
When you jack the car up, you might as well pull on the tire top and bottom to make sure ball joints are ok too. Pull on tire at 9 and 3 o'clock positions to check tie rods as well. Can't hurt to do if you are raising the car to check tires out anyway.