help engine cutting after fitting td04 not fuel cut

[Dean-JDM-ep*1]

ok basically just started testeing my td04 turbo running standard ecu with sard fpr set at 2.5 bar now its running external wastegate and ive set it at 0.6 bar and it holds boost perfect with no creep but sometimes when accelerating hard the car cuts but it doesnt feel nothing like fuel cut its not harsh like fuel cut and its not spiking has any 1 got any ideas? ,map sensor etc???

thanks Dean