Shift Timing

[J-B Racing]

Can anyone tell me what is causing the trans at 1/2 to 3/4 throttle to not know what to do when it`s shifting from 2nd to 3rd? It up and down shifts rapidly until I let off the throttle...
At normal driving, it`s fine, and WOT it`s OK but I usually manual shift when Racing.


Thanks you experts...


Joe