boost problem

[twr]

Right i seem to be having a fluctuance in boost. Some times it will boost to 16 psi and sometimes it can only see 10psi. Can anybody shed anylight on a potential problem. The readings are being taken from an aftermarket boost gauge. Ive checked all hoses and they are all fine.

[M-R-P]

Try it without the mbc attached, see if it's stable then.

[oblark]

Sticky wastegate ?

[t5 pete]

I too would start off removing the mbc as the 304ap should see you at 15-16psi and see what results you get with that alone