how much would it cost to change out the valves and who would change them out on 2002 Pontiac Grand Prix

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
the car dont have no power or barely move and sputters when u take off.
(3) Answers
| |
seek a prof diag and est
How were the valves diagnosed to be the cause.What kind of tests were done?
I would do a compression test first
Qualified Local Pontiac Shops
Qualified Pontiac Shops For This Repair