GEES97TA

I think this sounds weird but i would like some opinons. When i brought my car back to the shop that dyno tuned it,for my new ACCEL 300 plus,they said that the computer had to learn it.Is this true reason why is because as i use the car more and more it seems to be running a hell of alot better then before.I used to have a stumble and it wouldn't redline without fluttering a little which i was told it was the spark being blown out,but now i have the new box on so it shouldnt do that anymore..But is there any truth to what they said it relearning the ignition box?