I have a problem. I was driving and my car started jerking and power cut out (as if someone was cutting off the fuel, or cutting the ignition). Now it is undrivable with a very rough idle. Also running very rich with black smoke out the back. Engine vacuum is also down to 10 when usually it is at 20 at idle. I disconnected the MAF sensor and the idle smooths out and vacuum goes back to 20. So I figured for sure it must be the MAF sensor. However, I switched the MAF sensor to a back up one I had and it does the exact same thing. Once I connect the MAF the idle gets really rough and the car is undrivable. I highly doubt both my MAF sensors are broken. Not sure what else it could be? I am not getting any codes on VAG-COM.
I am going to try switching the ECU as I have a spare. Clearly it is something electrical. Maybe a solder joint on my chipped ECU cracked?
Also, it is a 98 AEB (with a K04 turbo), so there are not that many sensors.
Anybody have any other ideas?