To me it sounds like a fuel related problem. Just the other day I floored it down the street where I work, almost redlined in 2nd gear. I stopped pretty fast and parked. The engine was nice enough to shut itself off for me. I'm pretty sure I flooded it. It wouldn't start up again until I waited a few minutes and it ran fine. That sounds a little like what you have with the engine idling hard after revving. I'd look into the fuel system, the things swissarmyca pointed out would be a good place to start.