I agree with Silver GTP,
SAme thing happend to me, I accidently erased all the what the computer had learned and was compensating for my transmission that has 150k, and let me tell yea, it shifted like mush. fortunatly, I was working on shift firmness and timing to begin with and was able to bring back, and also make it shift better than ever by adding only 2-5 psi to the shift pressures, and reducing shift time by .25sec. I also added 10% minumum duty cylce to the TCC to help it hold under load.
