It doesn't really idle roughly, but the engine has been getting louder and louder recently...sounds like the lifters are just getting increasingly noisy. I also noticed that after the engine warms up to normal operating temp, the car will idle really low, like just barely above 500rpms...I never noticed it before, and not sure if it's a bad thing or not.

The car itself only has 42k miles on it. We got it ~6 years ago with 21k on it. I guess tomorrow I will take it to Autozone(literally .1 of a mile from my place) and get the code read.