I have a customers 99 Jetta TDI in my shop, and I guess I'll give ya the whole story. Car came to me 3 months ago for low power. I swap MAF, Set IQ, set timing, Clean VGT, clean intake, already has EGR delete, swapped N75, Vacuum test VGT actuator (hand held vac pump while driving) VGT moves freely and with correct travel. No exhaust or intake leaks. I can NEVER get more than 1400 mBar MAP. Removed CAT, same prob. So I play with this thing for 2 weeks and the customer get impatient and takes it to the dealer "who knows what they're doing". (btw, this has been a good long time customer!) I don't hear anything for a long time about it. Then I find out that dealer reflashed the ECM, did a compression check, replaced MAF, replaced the TPS, replaced turbo, and who knows what else. They had the car for 7 weeks, and finally gave up. Now the car is back at my shop, I'm going to try swapping the MAP sensor tonight even tho it reads 1003 mbar with engine off, and a max of 1400 with a nice smooth sweep. Next I'll swap ECMs, and then what? I've read the whole low power, limp mode, uncommon low power, the whole d@%m internet, etc. Car used to have Kerma's tune, but that's gone after the dealer got ahold of it.. Maybe I'll just have jeff at rocketchip flash it and cover up the problem for them: I'm just pulling my hair out, any ideas?