Codes popped up at the same time, 301 first, 302 second, 440 third, all on one code check, and I don't know when the last spark plug change was, I've had the vehicle for a year and a half, and I kn ow that I haven't changed them since I got it.
You could use an accelerant like brake cleaner with a straw and spray the stream towards the injectors, base of the intake, vacuum lines. Anywhere there would be a possibility to suck in air past the MAF. Look for hardened or cracked vacuum hoses. Cracks in the intake tube. Check the condition of the hoses from the engine to the gas tank and the ones up the filler neck to the cap.
Most likely, you have a leak at the engine. The EVAP uses vacuum from the engine to operate. If there is a low vacuum condition, the engine will run lean, causing a misfire and there will be an issue with the EVAP system.
Update: changed spark plugs, spark plug wires, two fuel lines, fuel filter, and one vacuum line, check engine light is off for now, idling smooth but still around 500 rpm. Is it normal for the 97 Impreza OBS to idle that low?
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