Hi all,
I have a 95' 850 Turbo that once in a while starts, runs and then shuts down after a few seconds. Sometimes the car will run for days with no issue but lately it's happening almost every other day and it's taking longer and longer to get it started. I got two codes one for O2 Sensor and another for the MAF. the MAF code may have been because I disconnected it while the engine was running to see it it made a difference. Today I bit the bullet and spent $300 on a New MAF, and OEM Bosch one and the problem is still there. I know the O2 won't cause the car to shut down so What Else could it be? Anyone here have ideas??

​​​​​​Thanks in advance.
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My first thought is the fuel pump or fuel pump relay. Next time it fails, try jumpering the relay to see if that gets it going. Note that a failing fuel pump relay is often a warning sign that your fuel pump is drawing too much current and may be on its last legs. Sorry to hear you spend $$ on parts that don't seem to be related to the stalling - check engine codes really tell you about a condition not a cause. Example, O2 and MAF codes are saying the fuel trim is off. If your fuel pressure is too low (say from a wonky pump), that will impact fuel trim, even with a health O2 and MAF.