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To add to the above post, there shouldn't be any "set up to run rich so it turns lean at high RPM" or whatnot with a fuel injected vehicle. That used to be the way with Carburetors, but not so with EFI.
For anyone who has not tuned EFI, there is a very specific map that states "At X RPM and X throttle (or air flow or Manifold Air Pressure, depending on setup), put in X fuel." This means that if you wish to have it run lean @ 3000 RPM under light load it can be set that way while keeping you rich @ 5000 RPM under heavy load. There's no knob or anything that sets X amount of fuel to use across the entire range, each point on the map is individually set.
What I'm really going for here is that either it wasn't done right if it was a stock ECU swap, or the time was never really spent to tune the programmable ECU better.
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