no boost past 10psi?????

[C4ORCE]

hi guys for some reason my boost doesnt want to go past 9.3-10psi. when it hits these pressures the car cuts back similar to the way a top speed limiter feels. the boost and rpm's drop off significantly from almost 5500rpm and around 10psi to 2k rpm and running vacuum almost instantly. I've noticed the car is slightly hesitant when accelerating at about half throttle from a stop but then smooths out im not sure if these are related but seems like a possibility. oh and one other thing my gas mileage is terrible (less than 200miles to a full tank) this is under normal highway driving no hard boosting or erratic driving. as always any help is greatly appreciated.

[NolimitZ32]

Codes? MAF Issue, Vacuum Leak, Bad O2s, Injectors Dieing, Could be lots of different things, need more info.

[C4ORCE]

no codes, would the injectors dying cause all of these symptoms like the instant boost and rpm drops. i could see them causing hesitation and the gas mileage issue but this power loss has got me a little baffled to be honest

[Ace2cool]

There's a boost leak somewhere. Probably a loose clamp.

[C4ORCE]

yea thats prob gonna be this weekends project. doing a leak test should be to hard

[t.mcginley.jr]

You should clean the MAF with MAF cleaner while you're checking for leaks, its good practice even if that isn't your main issue

[C4ORCE]

ok i'll definitely keep that in mind is their anything else i should check out while im at it? i really wana get this nailed down. this and paint are the only things left before my car is complete