2005 Ford Taurus SE check engine light on?

On the car I got a p0300 and a p0316 code. I put some fuel injector cleaner in before filling up the gas to see if it would help. Is there any other possible ways to fix this?

http://www.obd-codes.com/p0316

http://www.autocodes.com/p0300_ford.html

Not that you can get for eight bucks at Pep Boys.

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