Even if I floor it, as long as I keep it under ~4,200 RPM it runs great. There is a very minor misfire at idle, which many drivers would not even notice, and which is not always present. The car really does run well other than the high RPM problem. Flooring it does not result in the bucking until ~4,200 RPM. Always starts on the first try, in a split second. Has never stalled on me, or even come close.

Autozone will check the computer codes for free, which is a nice service. I plan on having that done this week, perhaps today or tomorrow. I'm not sure how accessible the port is, however, and if access requires removing a cover. I think it's on the driver's side, near the door.