pummy023

So I have been having this same problem for about a month now. After four trips to the dealer, about to be five....they tell me that nothing is wrong with my car. So first I had a starting issue, where my car would start one day then not start the next day. Sometimes when I shift my car make this really loud fluttering noise, and this causes my car to bog severely and the boost wont go past 5. I have no clue what is wrong and obv the dealer has no clue either. Does anyone have advice on what could be the problem.