So my car started surging at 3k rpm in 2,3,&4th gear right after I had my MAFS replaced. So I went back and had it replaced with another one, and now it's starting to have a big drop off of power in 3rd and 4th at around 3k rpms. What could this be, does this sound like a boost leak, bc I looked and every hose feels like its on good. If you have any thoughts, please let me know.