Same happen to me when i brought my car modded up with a t3, begies etc but the overboost would kick when you floored it. Checked the ecu and there was no chip looked in the side door pocket and it was sitting there so i tried but the car would just turn and not start so i took it as being a faulty chip.

Got meself another chip and in the same ecu its working all fine now

So could be a bad connection or maybe even a faulty chip as mentioned by 'sailorbob'

get it checked by your local superchip dealer and see what the problem is and let us know

good luck