I've noticed over the past couple of months that my 04 Vibe seems to be sounding a bit more "growly" when driven (hope you can understand that adjective, it's hard to describe in words). It also noticeably vibrates when stopped and idling, whether in Park or in Drive. Not shaking the car apart, but enough to be noticeable and slightly annoying. Idle RPM's seem ok, they tend to be around 800 RPM and stable once the engine's warmed up.
I did have the intake manifold gasket replaced a year or so ago, and I cleaned the MAF sensor a couple of months ago. Actually, now that I think about it, the growly engine seems to have started around the time the MAF sensor was cleaned, although the idle vibration may have been happening before that.
What are some of the things that could possibly be causing these two issues?