Sure Fuel injector cleaner is all fine and good…but if you don’t have spark to light it all off…they wont get anywhere. When you have that no start condition is it after a long drive…what I’m getting at is it running long enough to FULLY heat up the engine and all of its components? Reason being…if an ignition component such as a coil pack or distributor cap is “on its way out” the symptoms usually arise when they are FULLY heated up…
Here is an example of a distributor cap… The cap (which you don’t have) has a microscopic crack in it it functions fine when cold and the crack is the smallest…then when its fully heated up the crack opens just enough (because of the heat) that it actually lets the high voltage (that would normally shoot down the spark plug wire and to the plugs)…leaks out to ground and NOT down to spark the plugs… This is how heat affects ignition components like coils and distributor caps…this could be a situation that your Subie suffers from…
Blackbird…