my zafira has started having problems boosting. as soon as i hit 2k revs its slows and the power holds back and the comes again in waves.
had a boost gauge on and it was going to 8/9psi overboost and holding 6/7psi.
again it was wavey.
there are no fault lights on, i've got a 5month old afm, plugs have done less the 8k, no boost leaks that i can see.
any ideas? i was thinking boost solenoids maybe?
i'm on a standard map with airbox mods and turbo back exh inc sport cat.
car has 89000roughly
cheers in advance