Actually, the subaru FI is not a bad unit but as with all new experiences you have to have enough of the common issues fail to be able to troubleshoot the car.
Get a ECU reader that presuppose s that you have a stock ECU and, an iPhone app. You can read codes which will tell you why what happened and clear codes. Then there is the normal simple stuff like fuel supply etc. I have drive by wire but you have a manual throttle. Start writing yourself a manual... :