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Injectors may also fail without being clogged, so cleaning them does not always fix the issue. Especially if they are original injectors. Also. Have you had the fuel lines and fuel pump checked?
Aroogah-
They've been given a cursory check by the guy who did the pre-purchase inspection and then my regular mechanic had a quick look to make sure it wasn't a death trap but nothing more than that, if it ain't broke type stuff.
The 150,000km service is due, I'll get him to give the fuel system a thorough going over, change the fuel filter, plugs, etc. Plugs are due anyway. It's gotta be one of plugs, injectors, fuel filter, MAF or O² sensor according to my exhaustive internet research.
RonAsheton
My Subaru has still been sputtering... Until today, it just stopped! Maybe the injector cleaner needed a bit more time to dislodge whatever gunk was there? I've done one tank with cleaner, two without, another with and now I'm halfway through another tank without.
Can it take this long to completely clean the injectors? It'll probably come back tomorrow and it'll be the MAF/O² sensor or the plugs not the injectors. 😵💫