All the way through the rev range as well?
These cars are known to be a bit hesitant when cold if its on the standard map (Usually in the morning after being left for the night) so was just ruling that out since you said its all the time
Might be one of those things that a visit to one of the specialist on here if one is close enough to you might be better since you have already changed a lot of parts and its still no better. Could be the lambda, injector, coil pack etc or none of them