My 1995 850 turbo sedan started giving me grief today.

First indication of any trouble is that it stalled (just stopped running) at the traffic light. Started right up again and seemed ok.

Driving, it is intermittent between perfectly normal, and stumbling/rough running. If at idle, it may die. Other times it runs just fine. Check engine light eventually turned on during a long period of stumbling.

Tachometer does not drop when it stumbles - I'm taking this as indication that ignition (at least on low voltage side) is ok.

When it's stumbling, I can rev it up and accelerate, and it will typically accelerate through it. Thus, probably not a fuel blockage or partial blockage.

Since the tank was very low, (maybe 3 gallons left,) I pulled into a gas station and added 3 gallons. No change.

When I got to work, I did a quick cursory check that all air hoses are in place - did not notice any anomalies, though I was in a dark parking garage and trying to stay clean.

Pulled A2 codes, and got 414 (Boost Pressure Regulator) and 121 (MAF Sensor Signal Absent).

Searching in the archives, others experiences seem to suggest a failed/failing MAF. Not clear if disconnecting MAF will result in a drivable car, or just a car that will idle ok for test purposes.

Any other thoughts or suggestions? Thanks in advance!

Roger
'95 854T 232k miles
'87 245 M47 275k miles