Does a failing MAF sensor throw a cel ? I'm not getting a cel and it's acting just like there's water in the fuel? I replaced the fuel pump last week and I thought that cured the problem because it ran fine for a couple days but now it's doing it again. Daily driver.

Edited September 10, 201510 yr by darsdoug

MAF fixed mine.  No codes, random stalling, would restart and run fine for days/weeks.

I had a long thread on this a while back (along with other nasty symptoms -- horrible hesitation at startup). I changed the MAF and the coil and the problem appears to have gone away (knock on simulated wood interior pieces). In my case, the car would completely shutdown for a few seconds, then come back to life.

 

If you're interested in the whole sordid story: http://www.ultimatesubaru.org/forum/topic/149756-hard-deceleration-at-65mph-when-let-off-the-gas-transmission/?hl=deceleration

I unplugged the MAF at the pigtail and then plugged it back in and went for a twenty mile drive with zero problems. I also checked for vacuum at the fuel regulator while idling and its good. I know vacuum decreases at higher the RPM thus increasing fuel pressure to the injectors (compliments of the regulator).  Hopefully it was just moisture at the MAF plug-in causing the problem?