I'm joining this convo 8 years later but, I have the same problem. 2008 Outback 2.5. Starts easily, runs for .5 seconds and shuts off as if you removed the key. It's just weird it's like the car is getting a 'shut down now' message from somewhere. The question is where? Not getting and CEL codes, fuel pressure is great, all wires, connections, grounds, etc seem good. The only thing is that I replaced the air filter 2 days ago. It ran fine yesterday but, then this started today. Did anyone figure out the issue here?