 that says, hey, you know, because when you put it in neutral, you're not allowed to rev it up more than a certain point. It'll usually go up to like 1,500 RPM or so and hold it there. That's as high as you can rev it. You can't rev it up at the stop sign like you used to be able to when you put it in neutral. It kind of defeats the purpose, but you can put it in neutral, put it back in gear, and then go again. That might be what's going on, but I wonder if there's not something wrong with that throttle body. And there may even be some codes hidden in the system.