just bought a 95 LS 6 speed off ebay. I just Had timing belt changed on 6 speed LS , When accelerating it makes a whinny noise. I seems to me its not like what it used to be. How do you know you need a valve Job And can an Engine run with messed up valves. Will the engine light be on if it did? Will messed up valves cause horse power loss, but notice when going 80mph on the freeway it still 2500 rpm like before I have the job done would the rpm change or stay the same if it had messed up valves, Some body please answer my question the whinny noise is normal or not normal?