feelander 2 moment loss of power

hi everyone,

new here and would like some advise on a matter

freelander 2 57 plate hse td4

recently a problem has occured

i have moment loss of power if i need hard acceleration if seems to knock back with loss of power and continues untill i ease off and accelerate slowly, have had the computer on it but no faults have been found. has anyone any ideas of what it could be or what to check next.

thanks in advance

auto or man.

2.2 manual

it starts speeding up then gets to about 3 thou revs then kicks back and keeps kicking back till i ease off the gas