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Well technically you have fuel in the engine if you are getting a backfire in the intake. I would say the fuel is getting thru the injectors. But maybe not at the right time. Has anything happened to the timing belt or cams ?
all impreza recommends high ROM. although 99ron or 100ron is recommended, some uses unleaded for non-turbo and of course notice a sligth defference in performance using high ROM fuel. in your case is the reverse, means does't need to drain for a change.
just to be safe get it to a subaru dealer and get it checked on the diagnostics computer,if too much fuel is going in they can adjust it for max power/economy.depending on what YOU want.(the ignition map is adjustable,but only by subaru)also this engine demands an oil/filter change at 5k intervals,using full synthetic oil.(subaru use 10/40,in Europe/Japan)
Both are under the hood and easy to get to. As for the Air Filter nobody beats K&N they are simply the best. Any fuel filter thats the right one will do.
On both cars, check the fuel pump/guage harness connector under rear seat - the old fuel pump draws too much current and melts the connector causing poor conatct & voltage drop off. Easy to see usually, just cut the two fuel pump wires from either side of the connector and re-join with new crimp connectors, or solder joint.
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