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I had the ecu fix also. It is only noticeable when the TRAC kicks in. My problem was also from 2nd to 3rd. It is very easy to duplicate. Just punch it from a stop when making a right turn. It used to hesitate while the engine stayed flat, like hitting the rev. limiter. It still hesitates now, but the engine would continue to rev and the tran. catches on a lot faster. It doesn't make any difference under normal driving condition. I was also told that the updated TRAC unit is on the 3 revisions as of now. Not sure what the differences are from the previous versions of the TRAC's.
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