2004 gti agu dying under boost

[lilcrash]

hey everyone, my gti has been coughing and spluttering when ever it gets over 6psi and occasionally coming onto boost, i have already replaced the igniter booster box (bosch 0227100211) and fitted new spark plugs (ngk pfr6q) and cleaned the maf sensor, its still coughing and dying, any ideas?

100% stock apart from a 3" front pipe/turbo down pipe and a k&n panel filter.


thanks for any help

[Sirocco20348]

Have you run vagcom and retrieved codes?

Has the car ever boosted correctly with the 3" downpipe?

[lilcrash]

Yeah it's been running fine for months. Miss started last week, no error codes apart from the normal one for the dodgy air con motor.

[lilcrash]

Ok well unplugging the maf doesn't make a difference. Does that mean the maf is dead or does that mean it's not the maf?