Hi and thanks for using 2CarPros.com.
Based on your description, it almost sounds like there is an issue with low fuel pressure. Since the vehicle struggles going up hills and you notice a low idle, that is the first thing I would recommend checking. Here is a link which describes how to check fuel pressure:
https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator
I would like to get the fuel pressure specifications for you, but all my sources say that a Civic of this year 1.5 or 1.6L engine. Both the 1.5 and 1.6 require the same pressure. Look at picture 1 for that information.
Let me know what you find or if you have other questions.
Take care,
Joe
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Monday, July 16th, 2018 AT 7:41 PM