Hi, i was wondering if anyone has ever had this problem on their car? Basically my car has always had a problem where the power dies down around 3k rpm. I have as i read i many threads changed the Mass air flow sensor but it has not helped. i have then since put my car (1.8T quattro, AJQ engine) onto a diagnostics machine and it has come back with an Overboosting prooblem, anyone help??