Mk4 Golf 1.8T - Performance stuttering around 4k revs??

[Mo*]

Hey, I've had my Golf for sometime now & it's pretty much always had a performance sort of stuttering issue. Basically if you drive it normally it's fine, but if you put your foot down hard & enter into the turbo area of the revs, it starts to stutter & jerk, as if it's got a fuel supply, or electrial fault. Within a second or so it clears & off it goes.

It's been plugged into static electrical diagnosis kit & nothing, although I've been advised to stick it on a rolling road to see if anything else shows up.

Has anyone come across this issue before?

Cheers all
Mo

[Mo*]

Cheers, but forgiving my ignorance, whats an MAF?

[Mo*]

That's a couple of things to crack on with then!

Nope, the car has never been remapped to my knowledge, & the problem started since I've owned it.