hey i seem 2 have a problem similiar 2 yours
in second or third wen i flat foot it the car seems 2 jerk at times. feels like its struggling.
must add that it doesnt happen all the time.
its standard apart from cat back exhaust, pod and bov. Car seems fine otherwise.
Had feed back, and there suggesting it could be either:
-fuel pump
-engine coils
spark plugs
Hope that helps