Hello, my Outback quit running yesterday as I was driving it down the road. It seems like a fuel related issue since it slightly sputters when turning over the key. I charged the battery and checked the fuel pressure (44psi at the throttle body). I also had a head gasket replacement, new timing belt, etc. replaced about 10K miles ago so I'm guessing the timing isn't as issue. Any suggestions on how to troubleshoot?