05 srt-4 white
Guy hasn't even did a boost leak test and your going way off the basic trouble shooting. Let him check things over it could be a number of different things. But for starters you check for leaks to diagnose problems. In many different ways. Low vacuum could be allot of things as well but once again a pressure test will eliminate boost and any vacuum problems and allot of guess work. Just because one person had one thing happen don't mean it's the same for everyone. Just saying don't give worst case right off the bat. Just saying. Also wga solenoid going out will cause this exact boost pressure issue as well. Not saying its the vacuum problem.