2002 Pontiac Grand Prix Q&A

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

the car dont have no power or barely move and sputters when u take off. -
Answer 1
How were the valves diagnosed to be the cause.What kind of tests were done? -
Answer 2
seek a prof diag and est -
Answer 3
I would do a compression test first -