You might have the same problem as me. Has your check engine light came on? Cause it doesn't come on every time you floor it. It comes on every once in a while. You should put your car on a dyno and test your power, plus hook up a diagnostics thing to your computer to read the knock retard. Because my car is 100rwhp less than it should. The computer happened to be faulty and retard timing every time you floor it. Making the horsepower level drop. So thats maybe why you lost
Here is a link to my problem:
http://www.camaro5.com/forums/showthread.php?t=25857