GreenAlienTT

I've been getting a CheckEngine light recently and VagCom says its error code 17544/P1136. I've checked block 032 and fuel trims are within parameters. Block 002 gave me a mildly low level of 150 g/s at redline so I tried another MAF that I had sitting around, and got about the same reading. Most that I have read says that any reading "significantly" below 160 indicates a bad MAF. What is "significantly?"
Before I order another MAF is there anything else I should be looking for? I still wonder about a leak somewhere. I also notice that my Manifold Pressures are way below the Command. 1580 vs 2040 while accellerating.

2001 Quatro roadster, 225hp, non-chipped