Is this the only code you're getting? I had 1-1-3 together with two others recently. I can't recall the numbers, but according to Bentley one was the AMM burn-out function not working, and compensating for a lean fuel mixture. The 1-1-3 code made the check engine light come on if I recall. My car would idle very rough and inconsistently for a few days, before it finally started stalling, require depressing the gas peddle to keep the RPM's up, much like what it sounds like you're having to do. Turns out that by changing the air filter (hadn't been changed in about 60k miles) and simply disconnecting and reconnecting the AMM, everything went back to normal. I suppose you could have just as easy a fix. Let's hope so! :)