bad idle/running rich
 

well, while working on a small fuel leak coming from a set screw on my FRR, i wnet for a ride to see if all was okay and bam...car went pig rich on me...feels like a vac leak, but there is nothing obvious...so i unplug the maf and the car runs like it should? still running a bit rich but the idle was spot on? any suggestions, could the maf have taken a crap? i've been boosted for about 40K miles, the maf is right before the turbo...? thanks for any help!