FYI, My MAF sensor was acting up last year on my 99.5 Jetta TDI and once I replaced it with a new sensor (a Pierburg), it made a heck of a difference. It would actually get up to speed like it was supposed to. The only problem is that about 10k miles later, the car is starting to show signs of the MAF sensor going bad (just like before). Last night the engine light came on. I'm sure it's the MAF sensor although I haven't checked the code(s) yet. Talk about frosting my @$# like a 3ft tall snowcone. Sorry everyone, I felt like I had to vent my frustrations. It's a great car except for the dang MAF sensor.
By the way, how about those diesel prices? $2.29/gal in OH. I'm just glad the car gets such good mileage.
Dave