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Disconnect and clean the battery posts, and terminal clamps then reconnect. Afterwards complete a drive cycle to allow the the pcm to relearn the engine and transmission. Your owners manual should have the drive cycle under battery replacement section.
Have a qualified mechanic test the IAC (intake air control) valve, and clean the IAC port passages on the throttle body. During idle, the engine gets combustion air only through the IAC port. If the port is clogged with carbon, tbe engine will not idle properly.
Disconnect the battery terminal closest to the firewall that has two plastic wire connectors along side the battery. Disconnect the two connectors and clean all the terminals with electrical cleaner, and an old tooth brush and paper towels. After the cleaner is dry, apply a small dab of dielectric grease to the contacts and reconnect everything. Leaking battery acid tends to foul-up these terminal connections.
My source has DTC 34 as Injector timing stepper motor fault.
Your problem is living in Potwin, Kansas! With all the oil refineries there, you are bound to get oil in your computer. Good Lock!!
The thermostat might be getting unreliable and allowing the engine to run cooler than it should. A defective thermostat is not good for fuel efficiency as the engine will be running rich. The preferred way to test a thermostat is to remove it, suspend it in a pot of water with a candy thermometer on the stove, and observe it open up as the water temp rises. You might just replace it with an OEM Subaru thermostat and skip the test. Don't buy an aftermarket thermostat to save money because the OEM ones are more precise and dependable.
Bank #1 system too lean = P0171. Check out the following web page. http://engine-codes.com/p0171_chevrolet.html
If the alternator bearing is seized, that will also keep the engine from turning over and starting.
Headlights that dim, and brighten sometimes indicates an alternator or charging system problem. The tire might have a leak at the bead and rim, small puncture, or valve stem leak.
Most likely a charcoal canister for the emissions system.