It's not dying (hasn't yet) but when the car is idling or in low RPMs the car (Mazda Protege 5 2002) is fluctuating in RPMs.
Also, the last start was rough.
I've had issues with air intake before that seemed similar (cracked intake) but this seems a little different. I don't recall the rough idling having the regular up/down like it is doing now.
Any idea what I should be checking first?