My boyfriend urged me to rev his '65 GTO. I wasn't familiar with the car- first time driving it. It kept feeling like it was about to stall, and he kept telling me to rev it more. I finally took foot off gas and it stalled. Turns out I did something to a valve. First mechanic refused to work on it, afraid something was going to fall into the engine or something. He insists I did nothing wrong and probably saved him from blowing the engine. Now it sounds like the engine is being rebuilt. I'm feeling really guilty, like it is my fault, and I want to make things right. Any idea of cost to repair this issue? I feel so bad. Thanks for any input!