1.8 s reg astra sport
not had it long ,fitted a k&n ,and a remus center with a decent backbox
the car seems to struggle at low revs especially when pulling away from a junction the revs seem to be there but when i pull away they seem to die out and then come back again which is a bit strange as you end up pulling away a bit quicker than you thought because you give it more throttle when it dies ,also at higher revs it seems to be struggling a bit (not performing quite as it should (slightly under powered )
not used to this engine yet so would very much appreciate your help and advice in what to look for ,check or replace
cheers daz