intermittent boost and sputtering please help.
when i first got it there were no issues and it drove fine. but over the last few weeks its gradually sputtered more and more after it gets into boost and now its wont boost over 15psi AFTER its warmed up. it was boosting up to 19 to 20psi consistently.
once in a while it will start to boost and then just drop right off and the boost is just gone till i shift to the next gear or let off the gas and then give it gas again.
this is a 2002 tt quattro(awd) it has an after market exhaust, tune and coil overs. dont really know much more about it than that.
thank you for any help.
brian





