I think my car is loosing boost at times, is there a way i could find out where its coming from without going to the dealer? I called the dealership and they mentioned maybe the stock DV is sticking. Any ideas of what i could do?

 

get a boost gauge and it answer a lot of questions

 

It could also be your mass air flow sensor. Best thing to do is vag it but i know a lot of places including the dealership can get a little pricey.