 If it doesn't, why not? What's affecting it? I don't think it's necessarily a bad O2, not from changing valve covers. All right? I think you're going to prove that the O2s work, but I think if you took it for a ride, I don't think you're going to hit nine-tenths of a volt or sitting there at idle, you won't see nine-tenths of a volt because I think you've got a vacuum leak. You've got some sort of a fuel mixture issue.