My 2001 1.8t was throwing a code for MAF, replaced MAF and code is still on. Previous owner rewired the MAF at one point and think they may be wired wrong. Anybody have the diagram or know what pins go to what color?

 

See if this helps. VWVortex.com - wiring diagram of MAF-sensor and plug to MAF

Also, to test to see if MAF is causing a problem, you can unplug it. If the car runs better without it, it's the MAF giving erroneous signals to the ECU. The ECU can run the engine with the O2 sensors pretty well if it senses the MAF is not there.