Hi,
The two codes are related to two different things. The evap leak (small leak) can be something as simple as a bad fuel cap. Remove the cap and make sure there is no rust or corrosion around the top of the filler neck. If that all looks good and the cap is good, I recommend having the EVAP system smoke tested.
Basically, smoke is injected into the EVAP system at a very low pressure. If there is a leak, the smoke will come out at that point. I suggest this because if there is a crack in a hose or something other that is similar, it will be very difficult to find.
The idea that the EVAP code could cause a "small" vacuum leak could cause an idle issue.
Next, the idle air control performance is related to the high idle. The IAC valve is responsible for maintaining engine idle speed.
I attached the diagnostics for the P0519 below. Let me know if it is something you are comfortable trying. Also, please feel free to let me know if you have questions or need help with something.
Also, here is a link that explains how to service an IAC:
https://www.2carpros.com/articles/idle-air-control-valve-service
Take care,
Joe
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Saturday, July 24th, 2021 AT 8:48 PM