2002 TDi Jetta wagon
This issue started the day before yesterday. I start the car. Everything seems fine. Go to drive and it's normal to ~2000rpm then the CEL goes on and there's no power. If you stay on the gas so it doesn't shift and wait for it to get to around 2800 rpm, suddenly boost kicks in and it takes off. After that it drives like normal until you shut it down.
Every time you start it, the same thing- starts fine, no CEL, seems fine. Then rev (under load, not neutral) to 2k, CEL turns on, stay on it to 2800, boost kicks in and it drives like normal until you shut it down.
The code it's throwing is P0101 (MAF-related stuff). I cleaned the MAF today, checked the air filter and checked my vacuum lines. Everything seems fine, though I didn't thoroughly check my vacuum lines with a vacuum gauge - just checked the turbo actuator and waste gate; both held vacuum.
I also don't think it's the MAF - we were out of town - I drove it 350 miles like this and it actually seems to be getting better mileage than normal, even though we climbed a 4200 foot mountain pass 3 times at 60mph with 4 adults, a baby, a 70 pound dog and rooftop box full of ski/overnight gear.
The most likely culprit in my mind is one of the little vacuum valves but does anyone have other ideas?