I have a 1996 subaru legacy (2.2L) wagon. A couple of years ago, we had to replace the engine after a head gasket issue. A couple months after this replacement, this issue developed. The car would be idling normally, and just quit. No rough idling, no warning lights - just on / off. It only occurs with the engine idling (stop lights, parked, etc.) and will occasionally be proceeded by a rough feeling transmission shift while driving (especially between 40- 55 mph), though I do not know if it is related. This issue is intermittent, and does not seem to occur until the engine has been running for at least some time. Normally the car will restart immediately, with a flashing A/T oil temp light that will disappear after a few seconds; however, sometimes it requires more attempts to restart, lately. I have taken the car in a few times, but, unfortunately, the subaru dealership could not replicate the issue. It is beginning to happen more frequently now, and I am about ready to take the car back in. I thought I would poke around here first and see if there was anyone with experience on what it could be.
I have cleaned the MAF sensor per instructions already - that seemed to help for a few weeks. I was thinking of attempting to clean the idle air control valve or replacing the fuel filter. Any help would be severely appreciated.