Last week during a cruise I was attempting to make it up a hill and my car was acting like it was going to die. This was the first time I noticed the issue. Since then it has been a PITA trying to figure out what is causing it. I've recently noticed it happens between 5inHg and 5psi. My idle inHg is around 18 and my boost depending on speed is 8-9psi. My idle inHg used to sit around 20 and my boost was around 9.
I have checked for vacuum leaks and as far as I can tell everything is normal.
I'm going to clean the maf in a bit. Does anybody have any other suggestions on what to check next?