2001 Buick Lesabre Stutter under power

2001 Buick Lesabre

This car runs perfect going steady down the road-when climbing hills it wants to stutter.

First thing to do would be to scan for check engine light codes. These codes will help guide you in the right direction. The codes will also help keep you from replacing parts that don’t need to be. My guess would be an engine misfire. But the nice thing about the codes is you will not need to guess.