[olddog]

If it was not chipped:

A good chance that the part throttle (where the engine runs most of the time) timing was too much, making less power and the engine nervous or jittery acting.

Even if it was chipped:
A good chance that at WOT you were not getting enough timing to make maximum power.

Deep under the Mass Flow strategy, there is an Alpha N strategy (throttle position and rpm only). It serves two purposes. One, if the mass flow sensor fails it will get you home. Two in sudden throttle change situations the Mass Flow strategy is too slow to figure out what to do and it switches back to Alpha N. When they do the ratio the mass flow sensor to the fuel injector size trick, and when the cid is not corrected, the Alpha N strategy is terribly wrong. This means it doesn't handle sudden throttle changes well and if you unplug the mass flow sensor, you aren't likely to get home.