replaced most of the vaccum lines they were kinda deteriorated. I was thinking the same thing with the wastegate. I did come in from testing the maf sensor and it was reading 44.8 kohms manual says it should read 2.5-4.0 ohms. So it's bad. Sucks too cause a new one is 168 bucks from autozone with a 60 core. I guess these things can be rebuilt. My first volvo, hell my first foreign car. I knew mustangs has MAF sensors so I thought I'd put thta in there. Sucks about the fuel pressure I can't find a schrader valve anywhere on it. I do know it's supposed to read a constant 42 psi at the fuel rail. I think I might just take this in to have someone look at it.