Re: P0174,P0171 Codes...
before you rack your brain and all that have you tried the simplest thing and unplugged your battery for a bit? After you did some stuff it might not have reset the computer and cleared the code. Just a suggestion before you really start diving in. I've seen it clear up several times before. Of course I could be wrong.
EDIT: Not saying this will absolutely fix your problem. Just might be worth trying before you really dive into trouble shooting.
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